View source for Spring 2025 Event/E-1

{{:{{ROOTPAGENAME}}/Hub}}
{{EventInfoBox
|title_en= Hokkaido Defence Operation
|title_jp= 北海道防衛作戦
|tag= [[File:{{ROOTPAGENAME}} Tag 1.png]]
|tag2= [[File:{{ROOTPAGENAME}} Tag 2.png]]
|header_thumb=[[File:{{ROOTPAGENAME}} E-1 Boss Thumb.png]]
|tag_text= {{Shiplock|{{ROOTPAGENAME}} Tag 1}} '''104th Squadron'''<br>{{Shiplock|{{ROOTPAGENAME}} Tag 2}} '''1st Fleet'''
|map_1= [[File:{{ROOTPAGENAME}} E-1 Map Phase 1.png|450px]]
|map_1_text=Map
|map_2=[[File:{{ROOTPAGENAME}} E-1 Map Phase 0.3.png|450px]]
|map_2_text=Gimmick 1
|map_3=[[File:{{ROOTPAGENAME}} E-1 Map Phase 0.7.png|450px]]
|map_3_text=Gimmick 2
|map_4=[[File:{{ROOTPAGENAME}} E-1 Map Phase 1.png|450px]]
|map_4_text=Phase 1
|map_5= [[File:{{ROOTPAGENAME}} E-1 Map LBAS Range.png|450px]]
|map_5_text=LBAS
|boss_hard= 2400 HP
|boss_medium= 1400 HP
|boss_easy= 1400 HP
|boss_casual= 1400 HP
|phase_1_boss= {{EnemyLink|Transport Ship Wa-Class B (Landing) Flagship}}
|rewards = E-1
}}

{{center|[[File:{{ROOTPAGENAME}} E-1 Ooyodo.png|440px]]}}

The event guides are to be constructed through the respective [[/Sandbox|Event map page guide sandbox]] and reviewed by editors before being approved here. 
*'''Do not update the guides through this page unless it is a minor fix.''' Please only update guides through their respective sandbox pages.

==Branching Table==
{{MapBranchingTable
|title = E-1 Branching Rules (Start Points) ▼/▲
|id = 60-1a
|0 -> 1 = * Start Point 2 is locked
* [Start Point 2 unlocked] Meet '''ALL''' of the following requirements:
** Fleet 1
** Amount of (F)BB = 0
** Amount of BBV ≤ 2
** Amount of CV(B) = 0
** Amount of CVL ≤ 1
* [[File:Spring_2025_Event_Tag_1.png]] 104th Squadron ('''Medium / Hard''' only)
|0 -> 2 = * Meet '''ANY''' of the following requirements:
** Fleet 3
** Amount of (F)BB ≥ 1
** Amount of (F)BB(V) ≥ 3
** Amount of CV(B) ≥ 1
** Amount of CV(B/L) ≥ 2
* [[File:Spring_2025_Event_Tag_2.png]] 1st Fleet ('''Medium / Hard''' only)
}}
{{MapBranchingTable
|title = E-1 Branching Rules ▼/▲
|id = 60-1b
|order = 2,A,B,B1,B2,C,C1,D,G,K,M
|2 -> B1/battle = * Does not meet the requirements to go to F
|2 -> F/empty = * Meet '''ALL''' of the following requirements:
** Amount of (F)BB(V) + CV(B/L) ≤ 2
** Amount of CL ≥ 1
** Amount of DD + DE ≥ 3
|A/empty -> B/empty, D/battle = Active Branching
|B/empty -> B1/battle = * Does not meet the requirements to go to B2
|B/empty -> B2/pink = * Meet '''ALL''' of the following requirements:
** Amount of CL + CT ≥ 1
** Amount of DD + DE ≥ 2
** If Slow Fleet, then amount of (F)BB(V) + CV(B/L) = 0
|B1/battle -> B2/pink = * Start from Point 1
* Does not meet the requirements to go to F
|B1/battle -> F/empty = * Meet '''ALL''' of the following requirements:
** Start from Point 2
** If Fast Fleet, then amount of (F)BB(V) ≤ 4
** If Slow Fleet, then amount of (F)BB(V) ≤ 3 
|B2/pink -> C/battle = * Does not meet the requirements to go to C1
|B2/pink -> C1/battle = * Meet '''ALL''' of the following requirements:
** Amount of CA(V) + CL + CLT ≤ 3
** If Slow Fleet and amount of DE ≤ 1, then amount of (F)BB(V) + CA(V) + CLT = 0
** ???
|C/battle -> G/battle = * Does not meet the requirements to go to I
|C/battle -> I/empty = * Meet '''ALL''' of the following requirements:
** Route to I is unlocked
** Fast Fleet
** Amount of (F)BB(V) = 0
** Amount of CV(B) ≤ 1
** Amount of CL ≥ 1
** Amount of DD ≥ 3
|C1/battle -> C2/gray = * Route to K is locked
* [Route to K unlocked] Does not meet the requirements to go to K
|C1/battle -> K/battle = * Meet '''ALL''' of the following requirements:
** Amount of SS(V) = 0
** ???
|D/battle -> D1/empty = * Does not meet the requirements to go to D2
|D/battle -> D2/battle = * Meet '''ALL''' of the following requirements:
** Amount of ships in fleet ≤ 5
** Amount of DD + DE ≥ 2
** ???
** Does not meet the requirements to go to D3
|D/battle -> D3/pink = * Meet '''ALL''' of the following requirements:
** Amount of ships in fleet ≤ 5
** If Fast Fleet, then fleet must only contain CL, CT and DD
** If Fast Fleet, then amount of CL + CT = 1
** If Slow Fleet, then amount of DE ≥ 3
* Otherwise, fleet contains exactly 1CV(B/L) 2DD 2DE
* Or, fleet contains exactly 1CL 3DD/DE
|G/battle -> K/battle = * Does not meet the requirements to go to M
|G/battle -> M/battle = * Meet '''ALL''' of the following requirements:
** Amount of (F)BB(V) ≤ 2
*** If Slow Fleet, then amount of (F)BB(V) ≤ 1
** Amount of CL ≥ 1
** Amount of DD ≥ 2
|K/battle -> L/pink = ???
|K/battle -> M/battle = ???
|M/battle -> N/empty =  * Fail the LoS check
|M/battle -> O/battle = * Pass the LoS check (Cn3 = 46~50 '''Hard''')
}}

<nowiki>*</nowiki> = Rule under review

? = Ship type/amount under review

Branching compositions are reported over the course of the event. 
*Please refer to [https://tsunkit.net/nav/#/ KCNav] for up to date map content (fleets used, LoS/speed requirements/drops/LBAS ranges, ...)

==Historical Bonuses==
'''{{color|red|Do note that several of the 5th fleet members will have historical significance in the "2nd Stage Operations"!}}
{{/Historical_Bonuses}}

==Map Overview==
E1 is a single/striking fleet, single-phase map consisting of route unlocks & one boss phase.
* 2 [[LBAS]] are available on this map:
** Only 1 can be set on '''Sortie''', the other being limited to '''Defense''',
* This map uses 2 locks:
** [[File:{{ROOTPAGENAME}} Tag 1.png|40px]] '''104th Squadron''', Starting point 1 (reused in E-3)
** [[File:{{ROOTPAGENAME}} Tag 2.png|40px]] '''1st Fleet''', Starting point 2 (reused in E-2)

The use of {{IconText|{{Aviation Personnel}}|AGDP}} {{EquipmentLink|Arctic Gear & Deck Personnel|text=AGDP}} on CV(B/L), {{Class|Ise|Kai Ni}}, [[Akitsu Maru Kai]], [[Kumano Maru]], [[Shimane Maru]], and [[Yamashio Maru]], is required to sortie these ships on the map.

* Node {{MapRoute|C2|green}} is a resource node.
* {{Balloon}} '''[[Barrage Balloon]]s''' can be deployed on node {{MapRoute|O|red}}

==Gimmick 1 - Unlock==
To unlock the next part of the map, the following steps have to be performed:

{|class="wikitable" 
! !! C!! E!! C2
|-
| Hard|| A+ x3|| A+ x3|| Reach x2
|-
| Medium|| A+ x2|| A+ x2|| Reach x2
|-
| Easy|| A+ x2|| A+ x2|| Reach x2
|-
| Casual|| A+|| A+|| Reach
|}

{{FleetGuide
| Map = Node C
| Fleet = '''1 CA, 1 CL, 3 DD, 1 DE [[File:{{ROOTPAGENAME}} Tag 1.png|30px]]'''
| Route = {{MapRoute|1||A|blue|B|blue|B2|pink|C|red}}
| Speed = '''Slow'''
| ASC = 0
| ASE = 0
| ASM = 0
| AS = 0
| Note = C is a surface node.
*Bringing [[AACI]] is advised to reach it. 
| Range = Node {{MapRoute|C|red}}: 4
| LBASS = 0 / 0 / 0 / 0
| LBASD = 102 / 123 / 153 / 204
}}

{{FleetGuide
| Map = Node C2
| Fleet = '''1 CL, 3-5 DD, 0-2 XX [[File:{{ROOTPAGENAME}} Tag 1.png|30px]]'''
1 SS(V) [[File:{{ROOTPAGENAME}} Tag 1.png|30px]]
| Route = {{MapRoute|1||A|blue|B|blue|B2|pink|C1|red|C2|green}}
| Speed = '''Fast'''
| ASC = 0
| ASE = 0
| ASM = 0
| AS = 0
| Note = C2 is a resource node, therefore, it is possible to continue even when taiha on node C1.
For the gimmick, sortie with a single submarine equipped with a {{Emergency Repair}} {{EquipmentLink|Emergency Repair Personnel|Emergency Repair Goddess|text=Damage Control|link_category=Emergency Repair Personnel}} will guarantee to reach the end node.
*The route will not consume the material when the node is reached, even if the submarine is taiha.
*The 1 SS Fleet will route to 1 extra node at {{MapRoute|B1|red}} before going to {{MapRoute|B2|pink}}
*The sub does not have to be fast. A slow sub is sufficient to route to C2
Else:
*Bringing [[AACI]] is advised to reach it. 
*This comp can also be used to farm for fuel.
| Range = Node {{MapRoute|C1|red}}: 4
| LBASS = 0 / 0 / 0 / 0
| LBASD = 102 / 123 / 153 / 204
| NoteLBAS = LBAS can be sent on the pre-node to eliminate any threat
}}

{{FleetGuide
| Map = Node E
| Fleet = Fast: '''1 CL, 3-4 DD  [[File:{{ROOTPAGENAME}} Tag 1.png|30px]]'''
Slow: '''1 CVL/CL, 0-1 DD, 3-4 DE [[File:{{ROOTPAGENAME}} Tag 1.png|30px]]'''
| Route = {{MapRoute|1||A|blue|D|red|D3|pink|E|red}}
| Speed = '''Fast / Slow '''
| ASC = 0
| ASE = 0
| ASM = 0
| AS = 0
| Note = Shortest route
* Using [[OASW]] are recommended.
* 1 ship equipped with AACI is recommended for {{MapRoute|D3|pink}}.
Avoiding {{MapRoute|D1|blue}} needs 5 ships MAX.
Avoiding {{MapRoute|D2|red}} needs either 0 DE (Fast) or 3+ DE (Slow).
* Therefore, the two major options are 1 CL/CT 3-4 DD Fast, or 1 CL/CT/CVL 0-1 DD 3-4 DE Slow.
| Range = Node {{MapRoute|E|red}}: 3
| LBASS = 0 / 0 / 0 / 0
| LBASD = 102 / 123 / 153 / 204
| NoteLBAS = ASW LBAS should be used on {{MapRoute|E|red}}.
}}

==Gimmick 2 - Unlock==
To unlock the boss, the following steps have to be performed:

{|class="wikitable" 
! !! H!! G!! C2
|-
| Hard|| S x3|| S x3|| Reach
|-
| Medium|| S x2|| S x2|| Reach
|-
| Easy|| S? x2|| S? x2|| Reach
|-
| Casual|| S? x2|| S? x2|| -
|}

{{FleetGuide
| Map = Node H
| Fleet = Fast: '''1 CL, 3-4 DD [[File:{{ROOTPAGENAME}} Tag 1.png|30px]]
Slow: '''1 CVL/CL, 0-1 DD, 3-4 DE [[File:{{ROOTPAGENAME}} Tag 1.png|30px]]
| Route = {{MapRoute|1||A|blue|D|red|D3|pink|E|red|H|red}}
| Speed = '''Fast / Slow
| ASC = 0
| ASE = 0
| ASM = 0
| AS = 0
| Note = Shortest route.
The last node is surface battle one, so ASW is only advised to reach it, but not defeat it.
* Alternatively using Vanguard formation across nodes {{MapRoute|D|red|E|red}} can help the fleet survive the sub nodes as they focus on surface combat.
* 1 ship equipped with AACI is recommended for {{MapRoute|D3|pink}}
| Range = Node {{MapRoute|H|red}}: 3
| LBASS = 0 / 0 / 0 / 0
| LBASD = 102 / 123 / 153 / 204
| NoteLBAS = Recommend LBAS with with all bombers be sent to {{MapRoute|H|red}} to help improve chances of securing an S rank
}}

{{FleetGuide
| Map = Node G Tag 1
| Fleet = '''1 CA, 1 CL, 3-4 DD, 0-1 DE/SS(V) [[File:{{ROOTPAGENAME}} Tag 1.png|30px]]
| Route = {{MapRoute|1||A|blue|B|blue|B1|red|B2|pink|C|red|G|red}}
| Speed = '''Slow
| ASC = 0
| ASE = 0
| ASM = 0
| AS = 0
| Note = An alternative fleet using the 1st tag.
* The fleet must be SLOW in order to route to {{MapRoute|G|red}}
| Range = Node {{MapRoute|G|red}}: 5
| LBASS = ?
| LBASD = 102 / 123 / 153 / 204
| NoteLBAS = Recommend LBAS with with all bombers be sent to {{MapRoute|G|red}} to help improve S rank chances.
}}

{{FleetGuide
| Map = Node G Tag 2
| Fleet = Striking: '''1 (F)BB(V), 1 CV(B/L), 1 CL, 3-4 DD, 0-1 XX [[File:{{ROOTPAGENAME}} Tag 2.png|30px]]
| Route = {{MapRoute|2||F|blue|C|red|G|red}}
| ASC = 0
| ASE = 0
| ASM = 0
| AS = 0
| Note = Use this opportunity set up the fleet for [[#Phase 1 - Boss]] if desired.
* All nodes are surface combat
| Range = Node {{MapRoute|G|red}}: 5
| LBASS = ?
| LBASD = 102 / 123 / 153 / 204
| NoteLBAS = Recommend LBAS with with all bombers be sent to {{MapRoute|G|red}} to help improve S rank chances.
}}

;Node {{MapRoute|C2|green}}
*Refer to [[#Gimmick 1 - Unlock]]'s fleet for composition and routing.

==Phase 1 - Boss==
{{FleetGuide
| Map = Heavy Fleet
| Fleet = '''Striking: 1 (F)BB(V), 1 CV(B/L), 1 CL, 3-4 DD, 0-1 XX [[File:{{ROOTPAGENAME}} Tag 2.png|30px]]
| Route = {{MapRoute|2||F|blue|C|red|G|red|M|red|O|red}}
| LOS = Cn3: 80 / 100 / 100 / 55
| ASC = 0
| ASE = 0
| ASM = 0
| AS = 0
| Note = Decent fleet that takes the shortest path to the boss.
* XX cannot be a (F)BB(V)
* All fights are surface battles, so use Vanguard formation
| Range = Node {{MapRoute|M|red}}: 6 ; Boss {{MapRoute|O|red}}: 5
| LBASS = 0 / 0 / 0 / 0
| LBASD = 102 / 123 / 153 / 204
| NoteLBAS = Sending all LBAS on the boss is advised, else, sending them on node M is viable to increase the reach rate.
}}

{{FleetGuide
| Map = Super Heavy Fleet
| Fleet = '''Striking: 7 (F)BB(V) [[File:{{ROOTPAGENAME}} Tag 2.png|30px]]
| Route = {{MapRoute|2||F|blue|C|red|G|red|M|red|O|red}}
| LOS = Cn3: 80 / 100 / 100 / 55
| Speed = '''FAST+
| ASC = 0
| ASE = 0
| ASM = 0
| AS = 0
| Note = '''Do not deploy this fleet unless in possession of a large supply of duplicate battleships to lock, or playing in casual/easy for the rest of the event.
*'''Only consider as a possibility to run upon clearing the entire event when locks are no longer restricted.
*It is very powerful but very resource-intensive.
| Range = Node {{MapRoute|M|red}}: 6 ; Boss {{MapRoute|O|red}}: 5
| LBASS = 0 / 0 / 0 / 0
| LBASD = 102 / 123 / 153 / 204
| NoteLBAS = Sending all LBAS on the boss is advised; else, sending them on node M is viable to increase the reach rate.
}}

{{FleetGuide
| Map = Light Fleet
| Fleet = '''Striking: 1 CV(B/L), 0-1 CA(V), 1 CL, 0-1 CLT, 4-5 DD [[File:{{ROOTPAGENAME}} Tag 2.png|30px]]
| Route = {{MapRoute|2||F|blue|C|red|I|blue|J|red|L|pink|M|red|O|red}}
| LOS = Cn3: 80 / 100 / 100 / 55
| Speed = Fast
| ASC = 107
| ASE = 158
| ASM = 99
| AS = 227
| Note = Light fleet, cheaper to run, but will have to go through a sub node at {{MapRoute|J|red}} and an air node at {{MapRoute|L|pink}}.
* Use Vanguard on {{MapRoute|C|red|J|red|M|red}},
* Use [[AACI]] and Diamond on {{MapRoute|L|pink}},
| Range = Node {{MapRoute|M|red}}: 6 ; Boss {{MapRoute|O|red}}: 5
| LBASS = 0 / 0 / 0 / 0
| LBASD = 102 / 123 / 153 / 204
| NoteLBAS = Sending all LBAS to the boss is advised, else, sending them to node M is viable to increase the reach rate.
}}
'''{{IconText|{{Aviation Personnel}}|AGDP}} is required for all carriers.

{{MapRoute|M|red}} includes the new [[Destroyer Ra-Class]] α, which possesses Opening Torpedoes and has good combat strength.
*{{Smoke}} Smokes are highly recommended for {{MapRoute|M|red}} along with Vanguard formation to avoid taking damage.
Boss fleet consists of the new [[Transport Ship Wa-Class B (Landing) Elite]], which has high AA strength and is armed with a {{Balloon}} '''[[Barrage Balloon]]''', to counter damage from carriers and LBAS.
* Be advised that if a land base is sent to {{MapRoute|O|red}}, planes and rank loss will be significantly higher.
**It is therefore recommended to bring several {{Balloon}} [[Barrage Balloon]]s in order to both mitigate these and buff allied aircraft damage.
* Using Boss support is recommended.
* The Wa-class, which has high HP but lacks strong armor, is possible to defeat using double attacks.

==Enemy Compositions==
{{/Enemy comps}}
==Ship Drops==
{{/Ship drops}}
{{clear}}
{{:{{ROOTPAGENAME}}/Hub}}


==Trivia==
* Starting point 1 is in the area of Aomori.
* The airfield is the Misawa Air Base, which is known in Japan and among USAF units assigned there as the "Tip of the Spear as it is the Northernmost air base from Tokyo. This is also the same airbase where the practice drills for the attack on Pearl Harbor took place.
* Starting point 2 is off the coast of the Iwate Prefecture.
* Node C2 is on the area between Shiranuka and Kushiro.
* The Boss node O is between the island of Kunashiri and the coast of Shibetsu. Kunashiri is a probable staging point for the Northern invasion of Japan and the main battle area if the war had dragged on as the Soviets took over Kunashiri and several Kurile Islands before the official surrender of Japan.