Approximate time remaining before Friendly Fleets release:

April 1 2023 00:00:00 +0900

Early Spring 2023 Event Hub Overview
Introduction & Overview	Main Operation Maps	Extra Operation Maps
Introduction & Overview	E-1 \| E-2 \| E-3	E-4 \| E-5 \| E-6

The Early Spring 2023 Event, also known under the title of Absolute Defense Line! "Ogasawara Regiment" Relief, started on the 1st of March 2023. It is a "Large Scale Event".

The Main Operations consist of 3 maps, focused around Ogasawara Regiment on the Japanese mainland's shores.
- E-3 was released on the 3rd of March.
Extra Operations has been realized on the 18th of March, and is focused around Iwo Jima.
- E-3 was released on the 20th of March.

6 new ships has been introduced in this event:

2 LHA:
- "Kumano Maru", an IJA carrier/LHA, that, among others, can carry Fighters, Dive Bombers, and Underway Replenishments.
- "No.101 Transport Ship", a.k.a. "Momochi‎" or "101-chan", an IJN LST/LHA, that, among others, can carry Army Units.
2 DD are dropable across the event
1 DE is dropable on the EO,
1 CA is rewarded on E5.

For additional information regarding event-related subjects and content, please refer to Mechanics.

Historical Background

Related Historical Campaigns

Battle of Iwo Jima

Involved Ships

The following ships were involved in the upcoming operations:

Battle of Iwo Jima (500+ vessels)

US Forces
CV
Saratoga Mk.II
FBB
Washington Kai South Dakota Kai Massachusetts Kai

Information

Quick Info Table

Classification	Map	Name	Fleet Type	LBAS	Friendly Fleet	Fleet Tags	Notes
Main Operations	E-1	Operation S21	Single	1	TBA
	E-2	2nd Torpedo Squadron's Martime Guerrilla Warfare	Single Striking Force Combined	1/2	TBA	·
	E-3	Defeat the Enemy Air Raid Force!	Single Striking Force Combined	2	TBA	· ·	Ship locks affect routing on ALL difficulties is in theory optional, but highly recommended.
Extra Operation	E-4	I-Go Transport Operation	Single Striking Force	2	TBA	·
	E-5	Sortie! Hachiman Force	Single Striking Force Combined	2/3	TBA	· ·
	E-6	Decisive Battle! Counter Landing Operation at Iwo Jima	Single Striking Force Combined	Yes	TBA	· · · · ·	Ship locks affect routing on ALL difficulties Lock limited to Hard Only Once E-6 is cleared, tag restrictions stop getting enforced on every map! Tag routing may still be applied.

Fleet Locking Table

Tags	E-2	E-3	E-4	E-5	E-6 (Hard Only)
Yokosuka Defence Squadron			P1 & P2
2nd Torpedo Squadron	P1 & P2	P1 (& P2)		P1	P3
Supporting Combined Fleet	P3				P4
Combined Fleet		P2			P4
Carrier Task Force		P3		P2 & P3
Operation I-go Fleet			P1 & P2	P1 & P2	P1
Counter Landing Force					P2
Decisive Combined Fleet					P4

New Mechanics

Airstrike Supported Battle

LBAS can now equip Rotorcraft and Liaison Aircraft (since last update).
There is a new node type: "Airstrike Supported Battle" nodes. On this node, the enemy fleet will consist of:
- "Surface enemies" (4-5 SS so far), that are fought like in "Normal Battle" nodes,
- Followed by "air support enemies" (1-2 CVL so far), bringing air support like in "Normal Combat" nodes, and that cannot be attacked, being visually behind the rest of the enemy fleet and with no visible HP.
- It is advisable to use Vanguard Formation for Single and Strike Fleets and Cruising Formation 3 in Combined fleets.
There is a new new equipment type: Army Units, only equipable on the new LHA: "No.101 Transport Ship".

New Ships

DD	Yuugure	E-2, E-3, & E-5 Drop
DD	Heywood L. Edwards	E-2 & E-3 Drop
LHA	Kumano Maru	E-3 Reward
DE	Noumi	E-4, E-5, & E-6 Drop
CA	Tuscaloosa	E-5 Reward
LHA (LST)	No.101 Transport Ship	E-6 Reward

Returning Ships

Please refer to drop databases for the most updated lists of event drops, such as TsunDB or Poi-Statistics (or via Discord).


Yamashio Maru	E-1	Souya	E-1 & E-4	Yamato	E-2
Suzutsuki	E-2	Unryuu	E-2	Ariake	E-2
Amagi	E-3	Katsuragi	E-3	Nisshin	E-3
Fuyutsuki	E-3 & E-4	I-201	E-3	I-203	E-3
Scamp	E-4	Johnston	E-4	Akizuki	E-5 & E-6
Hatsuzuki	E-5	Shinshuu Maru	E-5	Hornet	E-5
Saratoga	E-5	Intrepid	E-5	Take	E-5
Langley	E-6	Iowa	E-6	South Dakota	E-6
Washington	E-6	Maryland	E-6	Atlanta	E-6
Honolulu	E-6	Ranger	E-6	Massachusetts	E-6
Fletcher	E-6	Helena	E-6	Brooklyn	E-6

New Equipment

New Enemy Vessels

Remodeled Wartime Cargo Princess (E3 Final boss)
Abyssal Heavy Cruiser Water Princess (E5 Final boss)
Supply Depot Princess D (E6 3rd boss)
Abyssal Stranded Landing Princess (E6 Final boss)

New Enemy Equipment

Friendly Fleets

Friendly Fleets (FF) come with a function that allows players to choose if they want to use a FF to aid them in battle or not. It is possible to choose between using "normal only" or "normal and powerful" FF. Powerful FF have an additional cost of 6 Instant Constructions for each time they are deployed in a battle (the blowtorches won't be consumed unless a powerful FF appears).

Soon™

Voice Lines

Soon™

Mechanics

Participation requirements

To take part in any event, a player MUST HAVE at least:

A 75% sortie win ratio.
5 empty ship slots.
20 empty equipment slots.

Special Mechanics

In addition to regular Sortie mechanics, events often involve some specific or rarer mechanics :

The difficulty system returns: it is possible to choose between Operation A (甲, Hard), Operation B (乙, Medium), Operation C (丙, Easy), or Operation D (丁, Casual).
- Difficulties and drops available depend on the HQ Level :
  - HQ 1+ for Casual and Easy, limited "rare drops" available.
  - HQ 35+ for Medium, some "rare drops" available.
  - HQ 80+ for Hard, all "rare drops" available.

Changing difficulty is possible but limited:
- When switching from any "lower" difficulty to any "higher" difficulty, the map will fully be reset.
- When switching from any "higher" difficulty to any "lower" difficulty, the map will stay in the very same state it was previously, with only +25% of TP/HP being reset on the current phase's TP/HP bar.
  - Gimmicks might also be reset when applicable.

Beginning with the second map, difficulty progression rules apply.
- In order to play a map on Hard difficulty, the prior map must have been completed on either Normal or Hard.
- e.g., to do E-2 on hard, E-1 must be completed on normal or hard.

To simulate simultaneity of battles in different locations, Fleet Tags conditions & deployment restrictions are employed.
- Ships not already tagged will be tagged with the associated tag of the map phase when deployed. This tag will be applied regardless of the difficulty and can't be removed by any measure before the end of the event.
- One map can use multiple tags, usually separated by phases or fleets.
- Several maps can share one or more tags.
- On Normal or Hard difficulty, ships must have either the same tag as the map/phase they are being deployed to, or have no tag at all.
  - This requirement is sometimes waived on certain maps, mostly on the last map of the event where tags only matter on Hard.
  - Once the event is cleared (last map of the EO), all tag restrictions stop getting enforced on every map (tag routing will still apply).

The Combined Fleet (CF), a fleet assembling both the 1st and 2nd fleets, may come back.
- The CF is only available for the two 1st fleets, where the 2nd fleet can be merged with the 1st one in the "Fleet menu".
- The CF cannot be used in anything outside of event sorties.
- 3 different types of CF are available, depending on the map requirements and the current fleet setup.
- CF with a flagship that carries the Fleet Command Facility, will be able to make use of the Evacuation mechanic.
  - The evacuation requires an escort destroyer.
  - Only one ship can be evacuated per battle.

The Flagship of the Escorting fleet cannot sink!

The Striking Force Fleet (SF), a fleet with seven ships, may come back.
- The SF is only available for the 3rd fleet, where an extra 7th ship can be added in the Fleet menu.
- The SF cannot be used in anything outside of event sorties.
- A SF with a flagship that carries the Striking Force Fleet Command Facility, will be able to make use of the Evacuation mechanic.
  - Only one ship can be evacuated per battle.

The Vanguard Formation can be used.
- This formation will organize the fleet such that the 2 to 3 last ships protect the 2 to 4 first ships of the Fleet.
- This formation is available for single and Strike Force fleets made of 4 to 7 ships.
  - The formation makes ships way more evasive in combat, especially DD, and more accurate against DD, especially PT Imps.
  - This formation is available only during the duration of the event, on the event's maps as well as on the regular maps.

NPC Friendly Fleets (FF) may be introduced to the event.
- FFs act as another unit that appears in particular battles to help aid the fleet when attacking the enemy.
- It is possible to choose between using "normal only" or "normal and powerful" FF in the main menu.
  - Powerful FFs have an additional cost of 6 Instant Constructions for each time they are deployed in a battle.
    - The blowtorches won't be consumed unless a powerful FF appears.
  - If activated, one FF is randomly selected from a preset list of fleets to help the fleet.
  - Which ships are in the fleet will influence which FF can help, excluding the FFs containing ships also in the main fleet.
  - The FF will appear at the start of either day or night battle, depending on the node.
- FFs are usually available sometime after the start of the event, to help Admirals facing difficulties clearing the maps.

Completion Gimmicks might be required to further progress the map, demanding certain conditions to be accomplished on a given map to unlock several things :
- Boss Debuffs, where once the "Last Dance" of the final boss of a given map is reached, its debuffed form can be unlocked.
- Map phases, where some map areas need to be unlocked, like on 7-2, 7-3, and 7-5.
  - Map areas can either be a path to the next boss, an intermediate path asking for new gimmicks, or a shortcut.
- LBAS Relocation.
- Choosing a higher difficulty on an event map will reset it to its initial state.
- These conditions range from reaching certain nodes, defeating specific nodes, attaining air superiority on certain nodes, and defending against Air Raids. As soon as all the given conditions are met, the map advances to the next phase. Lower difficulties may require fewer conditions to be met to complete the phase.
- Completing a gimmick will play a "bell" sound once back in the main port (Play Bell Completion Sound Effect).
- Nodes required to be visited/defeated in gimmicks are highlighted.

Enemy Radar Ambush Nodes, where entering these nodes will result in the fleet facing off against an enemy fleet that will ambush and attack it.
- The fleet will not be able to fight against the enemy fleet.
- By meeting certain conditions, these nodes can be evaded.

Emergency Anchorage Repairs:
- Both Akashi Kai and Akitsushima Kai can be capable of conducting emergency repairs; however, Akitsushima has more limited capabilities compared to Akashi.
- This consumes Emergency Repair Materials.
- Akashi Kai, Akitsushima Kai, and AO Kai will also take advantage of the special routing linked to this mechanic, even if it is not used.

High-Altitude Abyssal Bombers that are resistant to all types of interceptors other than the Land-Based Rocket Interceptors

.

Superfortress Air-Raid Sequence, a QTE where the LBAS is attacked by bombers, and where the player must click on a button at the right moment to obtain better interception, using "Land-based high-altitude interceptors".

Arctic Gear & Deck Personnel were introduced during the Fall 2020 Event, and need to be equipped on CV(L) to sortie them on "arctic" maps.

Event mechanics:
- Help:Event Preparation
- Combined Fleet (STF/CTF/TCF)
- Transport Operation
- Friendly Fleets (FF)
- Vanguard Formation ("Spoon")
- Striking Force Fleet (SF)
- Ship Locking ("Tags")
- Debuffs
- Emergency Anchorage Repair

General mechanics:
- Map Mechanics and Nodes
- Land-Based Air Squadron (LBAS)
- Support Expeditions
- Anti-Air Cut-in (AACI)
- Anti-Installation
- Line of Sight (LoS)
- Improving Ship Speed
- Special Attacks (Touch)

[edit]Event Only Drops History
Legend: R = Reward, D = Drop, Empty = not implemented yet/not yet know, N = not found (after implement)
Exclusive Ships	2014	2015 Events				2016 Events				2017 Events				2018 Events		2019 Events				2020 Events			2021 Events			2022 Events			2023 Events
Portrait Name	Fall	Winter	Spring	Summer	Fall	Winter	Spring	Summer	Fall	Winter	Spring	Summer	Fall	Winter	Early Fall	Winter	Spring	Summer	Fall	Hinamatsuri	Rainy-Summer	Fall	Spring	Summer	Fall	Winter	Spring	Summer	Early Spring
Akizuki	R	N	N	N	D	D	D	D	D	N	D	D	D	D	N	N	D	N	D	N	D	N	N	N	N	D	D	D	D
Prinz Eugen	R	N	N	N	D	D	N	D	D	N	N	D	N	N	D	N	N	N	N	N	N	D	N	D	N	N	D	D
U-511		R	D	D	D	N	D	N	N	D	N	D	N	N	N	N	N	D	N	N	D	D	N	D	N	D	N	D
Amagi		R	N	N	N	D	D	D	D	N	D	D	N	N	N	N	N	N	D	N	N	N	N	N	N	N	D	N	D
Katsuragi			R	N	N	N	N	D	N	N	N	N	D	D	N	N	D	N	N	N	N	N	N	N	N	D	N	N	D
Littorio			R	N	N	N	D	N	N	N	D	D	N	N	D	N	N	D	N	N	N	D	N	D	N	N	N	D
Roma			D	D	D	N	D	N	N	N	D	D	N	N	D	N	N	D	N	N	N	N	N	D	N	N	N	D
Teruzuki				R	N	N	D	N	N	D	N	D	D	N	N	D	D	N	D	N	D	N	D	N	N	N	D	N
Graf Zeppelin					D	D	D	N	N	N	N	D	N	D	D	N	N	N	N	N	D	D	D	D	N	D	N	D
Hatsuzuki						R	N	N	D	N	N	N	N	N	D	N	N	N	D	N	D	D	D	N	N	D	N	N	D
Iowa							R	N	N	N	N	N	N	D	N	N	D	N	N	N	N	N	N	N	N	D	N	D	D
Pola							R	N	D	N	N	D	N	N	D	N	N	D	N	N	N	N	N	D	N	N	N	D
Harukaze							D	N	D	D	D	D	D	D	N	N	N	N	D	N	N	D	D	N	N	N	D	N	D
Aquila								D	N	N	N	D	N	N	D	N	N	D	N	N	N	D	N	D	N	N	N	D
I-26								D	N	D	N	N	N	N	D	N	N	D	D	N	D	N	D	N	D	N	N	D	D
Commandant Teste									R	N	N	D	N	N	D	N	D	D	N	N	N	D	N	N	D	N	D	D
Matsukaze										R	N	N	N	D	D	N	N	N	D	N	D	D	D	N	N	N	D	N	D
I-14										R	N	N	N	N	D	N	N	N	N	N	D	N	N	N	N	N	D	N
I-13										D	D	N	N	N	D	N	N	N	D	N	D	N	N	N	N	N	D	N
Kasuga Maru											R	N	D	D	D	D	D	N	D	N	D	D	D	N	D	D	N	N
Gangut											R	N	N	D	N	N	D	N	N	N	D	D	N	D	N	N	N	N
Shimushu											D	N	D	D	D	D	D	N	N	N	D	D	D	D	D	N	D	D
Kunashiri											D	N	D	D	D	D	D	N	D	N	D	N	D	D	D	N	N	D
Etorofu											D	D	D	D	D	D	D	D	D	D	D	N	D	D	D	D	D	D
Hatakaze												R	N	D	N	N	N	N	D	N	D	D	D	N	D	N	D	N	D
Richelieu												R	N	D	D	N	N	D	N	D	N	D	N	D	N	N	N	D
Luigi Torelli												D	N	D	D	N	D	D	N	N	D	D	N	D	N	D	N	D
Matsuwa												D	D	D	D	N	D	N	D	D	D	D	D	D	N	D	D	D
Suzutsuki													R	N	N	D	D	N	N	N	D	N	D	N	N	D	D	N	D
Sado													R	D	D	N	D	D	D	D	D	D	D	D	D	D	D	D
Tsushima													D	D	D	D	D	D	D	D	D	D	D	N	D	D	D	D	D
I-400													D	N	D	N	D	N	N	N	D	N	N	N	D	N	D	D	D
Gambier Bay														R	N	N	D	N	N	D	D	D	N	N	N	N	D	D	D
Intrepid														R	N	N	D	N	N	N	N	N	N	N	D	N	D	D	D
Hiburi														R	D	D	D	D	D	N	D	D	D	N	D	D	D	D
Daitou														D	D	D	D	D	D	N	D	D	D	N	D	D	D	D
Jervis														D	N	N	N	D	N	N	N	D	N	D	N	D	N	D
Hamanami														D	N	D	D	D	D	D	D	D	D	D	N	D	D	D
Tashkent														D	N	N	D	D	N	N	D	D	N	N	N	N	N	N
Samuel B. Roberts ^{[EDT 1]}															N	N	D	N	N	D	N	N	N	N	N	D	D	D
Fukae ^{[EDT 2]}															D	D	D	D	D	D	D	N	N	N	D	D	D	D
Shinyou															R	N	D	D	D	N	D	D	N	D	D	D	D	D
Maestrale															R	N	N	D	N	N	N	N	N	D	N	N	N	D
Nelson															R	N	N	D	N	N	N	D	N	D	N	N	N	D
Gotland															D	D	D	D	N	D	N	D	N	N	N	N	D	N
Minegumo																R	N	D	D	D	D	N	D	N	N	N	D	N
Nisshin																R	N	N	N	N	D	N	D	N	N	N	D	N	D
Hayanami																D	D	D	D	D	D	D	D	D	N	D	D	D
Johnston																D	D	D	N	N	D	N	N	N	N	N	D	D	D
Giuseppe Garibaldi																	R	N	N	N	N	D	N	D	N	N	N	D
Colorado																	R	N	N	N	N	D	D	N	N	D	D	D
Hachijou																	R	N	D	N	D	N	D	D	D	D	D	D	D
Ishigaki																	D	N	D	N	D	N	D	D	D	D	D	D	D
Fletcher																	D	N	D	N	D	N	D	N	D	N	D	D	D
Duca degli Abruzzi																		R	N	N	N	N	N	D	N	N	N	D
Janus																		R	N	N	N	D	N	D	N	N	N	D
Mikura																		D	D	N	D	N	D	N	D	D	D	N	D
Grecale																		D	N	N	N	D	N	D	N	N	N	D
Perth																			R	N	D	D	D	D	N	D	D	D
Shinshuu Maru																			R	N	N	D	D	N	D	D	N	N	D
Atlanta																			R	N	N	N	N	N	N	D	N	N	D
De Ruyter																			D	N	D	N	N	N	N	D	N	N
Houston																			D	N	D	N	D	N	N	D	N	D	D
Hirato																			D	D	D	N	D	N	D	D	D	D	D
Akishimo																			D	N	D	N	D	N	N	N	D	D
Usugumo																					R	N	N	N	D	N	D	D	D
I-47																					R	N	D	N	N	D	D	D
Matsu																					R	N	N	N	D	D	N	N	D
South Dakota																					R	N	D	N	N	D	D	D	D
Hornet																					R	N	D	N	N	D	D	D	D
Jingei																					D	D	D	N	N	D	D	D	D
Kaiboukan No.4																					D	D	D	D	D	D	D	N	D
Ariake																					D	N	D	D	N	D	D	N	D
Helena																					D	N	D	N	N	D	N	D	D
Yashiro																					D	N	D	N	D	D	D	N	D
Washington																						R	D	D	N	D	N	D	D
Take																						R	N	N	D	D	N	N	D
Scirocco																						D	N	D	N	N	N	D
Sheffield																						D	N	D	N	D	N	D
Momo																							R	N	D	D	N	N
Northampton																							R	N	N	N	N	D
Honolulu																							R	N	N	N	N	N	D
I-203																							D	N	D	D	D	N	D
Makinami																							D	N	N	N	D	N
Suzunami																							D	D	N	N	D	D
Souya (AGS)																							D	D	D	D	D	N	D
Conte di Cavour																								R	N	N	N	N
Victorious																								R	N	D	N	N
Chougei																								D	D	D	D	D
Kaiboukan No.30																								D	D	D	D	N	D
Scamp																									R	N	D	N	D
Shounan																									D	D	D	D
Yamashio Maru																										R	N	N	D
Fuyutsuki																										R	N	N	D
Ume																										D	N	N	D
Tamanami																										D	D	N
Hayashio																											R	N
Maryland																											R	N	D
I-201																											D	N	D
Kurahashi																											D	N
Langley																												R	D
Ranger																												R	D
Jean Bart																												R
Ukuru																												D
Natsugumo																												D
Brooklyn																												D	D
Massachusetts																												D	D
Kumano Maru																													R
Tuscaloosa																													R
No.101 Transport Ship																													R
Yuugure																													D
Heywood L. Edwards																													D
Noumi																													D
This table includes all ships that are currently not permanently available outside of events (Limited Time Drops are still counted as "event drops"). ↑ Samuel B. Roberts introduced as a quest reward from 5A05 during the Kancolle 5th Anniversary ↑ Fukae introduced as drop in (Phase 1) 2-4 & 6-3 during Spring 2018 Mini-Event