Introduction

The screen after Daybattle. Click "夜戦突入" on the right to engage the Nightbattle

If your fleet has not defeated the enemy in day combat, you will get the chance to continue the fight in a night battle (夜戦). To engage in night battle, select the "Engage in Night Battle" (夜戦突入) option; to proceed without night battle, select the "Cancel Pursuit" (追撃せず) option.

The exception to this rule are night battle, night-day battle, air raid, and RADAR ambush nodes.

Overview

Example of engagement Order in Nightbattle

1. Firing order during night battle is based on the position in the fleet.

Turns can be skipped if a ship is sunk or disabled before they can take their turn.
Sunk ships are not counted towards the turn order.

2. Heavily damaged (大破) ships are unable to participate.

Ships revived by a Repair Goddess are able to participate even if they started the night battle heavily damaged. They will be unable to participate again if heavily damaged before their turn.

3. Ships with a base firepower and torpedo stat of 0 will be unable to participate in night battle.

4. The main fleet of a Combined Fleet is unable to participate in night battle.

5. Most carriers are unable to participate unless they have certain equipment. Please see Carrier Night Attacks for more details.

6. It is unaffected by engagement.

7. Ammo usage is increased by 50%.

8. Attack power is calculated using firepower and torpedo stats. Please see damage calculations for more details.

When fighting Abyssal installations, the torpedo stat is ignored.
The attack power cap is raised to 300 at night.

9. All ASW attacks will deal chip damage at night. This makes submarines impossible to sink.

The exception is battles that begin at night or combined fleet night battles.

Special Effects

Starshells and Searchlight are activated, the Night Recon can be seen over the enemy Fleet

All heavy cruisers gain +5
Heavy cruisers equipped with IJN 20.3cm guns will gain an accuracy and evasion bonus. Please see Gun Fit Bonuses for more details.
Star Shells increases accuracy by +5 and cut-in chance by +4 while decreasing enemy cut-in chance by 5 when triggered.
Searchlights increases accuracy by +7 and cut-in chance by 7 and decrease enemy cut in chance by -10 if triggered.
- They will increase the chance that the ship equipped with it will be targeted by +14% (+25% for Type 96 150cm Searchlight).
- They also drastically reduces the evasion it is equipped on by 80%. Please see Evasion for details.
Destroyers equipped with Skilled Lookouts and a RADAR will gain bonus evasion. The exact amount is unknown.

Night Contact

When there is a ship equipped with a Type 98 Recon Seaplane (Night Scout), there is a chance of triggering Night Contact if certain conditions are fulfilled.

Trigger Requirements

Your fleet must have obtained either Air Denial (AD), Air Superiority (AS) or Air Supremacy (AS+) in the fighter combat phase. Please see fighter combat for more details.
- In PvP, this extends to Air Parity (AP).
- For battles that begin at night, this requirement is waived.
The plane must be equipped in a slot bigger than 0.
In a Combined Fleet, it must be equipped on a ship in the escort fleet.
- It will still trigger if the ship has been retreated with the Fleet Command Facility.

Trigger Rate

[math]\displaystyle{ \text{Trigger %} = \left[ \sqrt{3 \times \text{Level}} \right] \times 4 }[/math]

If there is more than one night scout equipped, the game will check against them all.
Fleet LOS does not affect the trigger rate.
The state of air control does not affect the trigger rate.

Effects When night contact triggers, your fleet will gain several bonuses during night battle.

+10% accuracy
+5 firepower
Critical rate increase.
- The exact increase is not known.

Night Battle Special Attacks

When equipped with specific equipment setups, ships are able to perform powerful special attacks at night when certain conditions are fulfilled. The attack bonus from these modifiers are all pre-cap. For details on how that affects damage, please see Damage Calculations.

Trigger Requirements

The ship must not be heavily damaged (大破).
There must be no submarines in the enemy fleet.
- ASW capable ships are forced to attack submarines and will do normal ASW attacks.
The ship must be equipped with the appropriate equipment setup. See below.

Attack Types

The following are the minimum equipment requirements to trigger a night battle special attack.

Attack Type		Number of Equipment						Multiplier	No. of Attacks	Notes
Attack Type		Main Gun	Secondary Gun	Torpedo	RADAR	Skilled Lookout	Submarine Radar^[1]	Multiplier	No. of Attacks	Notes
Cut-In	Torpedo/Lookout/RADAR Destroyer Lookout	-	-	1	1	1	-	120%	1	Destroyers only.
	Main/Torpedo/RADAR Destroyer Mixed	1	-	1	-	1	-	130%	1	Destroyers only
	Main/Torpedo/Radar Special Destroyer Mixed	1^[2]	-	1	-	1	-	162.5%	1	Destroyers only
	Torpedo/Torpedo/Torpedo Submarine Torpedo	-	-	2^[3]	-	-	-	160%	2	Submarines only
	Torpedo/Torpedo/Sub RADAR Submarine Radar	-	-	1^[4]	-	-	1	175%	2	Submarines only
	Torpedo/Torpedo/Torpedo Torpedo	-	-	2	-	-	-	150%	2
	Main/Main/Main Gun	3	-	-	-	-	-	200%	1
	Main/Main/Secondary Mixed Gun	2	1	-	-	-	-	175%	1
	Main/Torpedo/Torpedo Mixed Torpedo	1	-	1	-	-	-	130%	2
Double Attack		2		-	-	-	-	120%	2

↑ Submarine Radar and Waterproof Periscope and Submarine Radar and Radio Direction Finder (E27)
↑ Special cut in for the 12.7cm Twin Mount Type-D Kai 2.
↑ Only applies to the Late Model Bow Torpedo Mount (6 Tubes) and Skilled SONAR Personnel + Late Model Bow Torpedo Mount (6 Tubes).
↑ As above.

Uranami is performing the DD-exclusive Torp/Lookout/RADAR-CI

Important Notes

If the ship fulfills the equipment requirements for more than one special attack, the one listed higher on the table takes priority.
- The exception are the destroyer exclusive cut-ins. If the higher priority cut-in fails, the game will check the next valid cut in.
Having multiple 12.7cm Twin Mount Type-D Kai 2 will increase the Special Destroyer Mixed Cut-in by 1.125x. This is multiplicative with the original multiplier.
If a night battle special attack fails to penetrate the enemy's armour or is evaded, chip damage will be dealt.
Midget submarines are not counted as torpedoes.
- Their torpedo stat still counts towards the damage calculation.
You can add more than the minimum number of equipment as long as you do not fulfill another attack requirement.
- Auxiliary equipment like AP Shells, seaplanes, RADARs and anti-air guns are recommended.
Special attacks that hit twice will roll independently to determine hit, critical chance and armour penetration.
- This figure is displayed as a sum for cut-ins.
- This figure is displayed separately for double attacks.

Trigger Rate

Double Attacks

The cut in rate for double attacks is extremely high. Testing places the value at around 99%.

Cut-Ins

Torpedo-Cut-In chance for a non-flagship without further modifiers. Notice the slow progression beyond 50 Luck

[math]\displaystyle{ \text{CI %} = \left[ \dfrac{\text{Param}_\text{CI}}{\text{Const}_\text{Atk}} \right] \times 100 }[/math]

Where:

If luck is less than 50; [math]\displaystyle{ \text{Param}_\text{CI} = \left[ 15 + \text{Luck} + 0.75 \times \sqrt{\text{Level}} \right] + \text{Mod}_\text{flag} + \text{Mod}_\text{Damage} + \text{Mod}_\text{Equip} }[/math]
If luck is 50 or greater; [math]\displaystyle{ \text{Param}_\text{CI} = \left[ 65 + \sqrt{ \left( \text{Luck} - 50 \right) } + 0.8 \times \sqrt{\text{Level}} \right] + \text{Mod}_\text{flag} + \text{Mod}_\text{Damage} + \text{Mod}_\text{Equip} }[/math]

[math]\displaystyle{ \text{Const}_\text{Atk} }[/math] is the constant based on the attack being performed.
- Gun = [math]\displaystyle{ 140 }[/math]
- Mixed Gun = [math]\displaystyle{ 130 }[/math]
- Destroyer Mixed = [math]\displaystyle{ 130 }[/math]
- Torpedo = [math]\displaystyle{ 122 }[/math]
- Mixed = [math]\displaystyle{ 115 }[/math]
[math]\displaystyle{ \text{Luck} }[/math] is the stat of the ship.
[math]\displaystyle{ \text{Level} }[/math] is the level of the ship.
[math]\displaystyle{ \text{Mod}_\text{flag} }[/math] is the flagship modifier of [math]\displaystyle{ 15 }[/math] if applicable. It is [math]\displaystyle{ 0 }[/math] otherwise.
[math]\displaystyle{ \text{Mod}_\text{Damage} }[/math] is the damage state modifier of [math]\displaystyle{ 18 }[/math] if moderately damaged (中破). It is [math]\displaystyle{ 0 }[/math] otherwise.
[math]\displaystyle{ \text{Mod}_\text{Equip} }[/math] are the various night battle equipment modifiers. See below for details.

Equipment Modifiers
Equipment Name	Friendly Bonus	Enemy Penalty	Notes
Star Shell	+4	-10	Notes	Can exceed the luck cap.
Searchlight	+7	-5	Can exceed the luck cap.
Skilled Lookouts	+5	-	Can exceed the luck cap. Only applies to the ship it is equipped on.

Important Notes

There are severely diminishing returns in trigger rate beyond 51 luck.
- It is not recommended to increase beyond 51.
The lower the attack constant, the higher the chance of a particular special attack triggering.
The formula above is obtained from information datamined from the KanColle Kai Vita game.
Marriage does not directly affect cut-in chances.
- The luck bonus and increase in levels do.
The flagship, damage state and equipment modifiers do not translate to a direct increase of the trigger rate. They would all be adjusted by the attack type constant.
Only the CI Bonus of one Skilled Lookout counts. Equipping a second one on a ship will not further increase CI chance.

Equipment Setups

Below are recommended equipment setups for night battle special attacks. If an attack type is not listed, it means that it is subpar and not worth considering. The order of the equipment is for illustrative purposes only. It does not matter what order the equipment are in.

Battleships
Equipment Setup	Attack Type	Notes
	Double Attack	This is the standard setup for all battleships. It maintains an artillery spotting attack and provides consistency of a night battle double attack. The wild card is usually a shell of some sort depending on the enemies you are facing. It must not be a torpedo, secondary gun or main gun.
Heavy Cruisers
Equipment Setup	Attack Type	Notes
	Double Attack	This is the standard setup for heavy cruisers. It allows them to double attack at daytime and nighttime. The wild card can be a radar, night battle equipment or even a Type 3 shell for anti-installation work. The wild card should not be a torpedo because it will interfere with night battle special attacks.
	Double Attack	This setup is for maximising firepower in day and night battle. Normally, this setup is used when you expect to be fighting under Air Parity (AP) or worse which disables artillery spotting. The wild card can be anything but another main gun or torpedo.
	Torpedo Cut-In	This is the typical setup for heavy cruiser torpedo cut-ins. The wild card can be anything but is typically night battle equipment to boost cut-in rates.
	Torpedo Cut-In	This is an alternate heavy cruiser torpedo cut-in setup for high-powered heavy cruisers like Myoukou Kai Ni. Because they easily hit the night battle attack power cap, they can take a main gun to increase their effectiveness in daytime. Ideally that gun would be an IJN 20.3cm for the evasion bonus. The wild card can be anything but is typically night battle equipment to boost cut-in rates.
Light Cruisers
Equipment Setup	Attack Type	Notes
	Double Attack	This is the standard setup for light cruisers. It allows them to double attack at daytime and nighttime. For light cruisers with four slots, the wild card be a radar or night battle equipment. The wild card should not be a torpedo because it will interfere with night battle special attacks.
	Double Attack	This setup is for maximising firepower in day and night battle. Normally, this setup is used when you expect to be fighting under Air Parity (AP) or worse which disables artillery spotting. For light cruisers with four slots, the wild card can be anything but another main gun or torpedo.
	Torpedo Cut-In	This is the typical setup for light cruiser torpedo cut-ins. For ships like Abukuma Kai Ni, one torpedo can be replaced with a midget submarine to maintain opening torpedoes.
Destroyers
Equipment Setup	Attack Type	Notes
	Double Attack	This is the standard night battle setup for destroyers. The wild card should not be a torpedo or secondary gun because it will interfere with night battle special attacks.
	Torpedo Cut-In	This is the typical setup for destroyer torpedo cut-ins. For destroyers with four slots, the wild card is typically night battle equipment to boost cut-in rates.
/	Torpedo Cut-In	This is an alternate torpedo cut-in setup for powerful destroyers like Ayanami Kai Ni. Because adding an extra torpedo will bring them over the night attack power cap, taking a destroyer main gun instead will allow them to maintain some effectiveness in day battle.
Submarines
Equipment Setup	Attack Type	Notes
	Torpedo Cut-In	This is the usual setup for submarines. For submarines with three slots, just put an extra torpedo on.
Seaplane Tenders
Equipment Setup	Attack Type	Notes
	Double Attack	If not carrying seaplanes, this is the setup you would use for seaplane tenders in night battle. The wildcard can be a midget sub if they are capable of carrying one or seaplanes.

Carrier Night Attacks

Normally carriers cannot attack at night unless certain conditions are fulfilled. There are three different kinds of carrier night attacks; carrier night shelling, Swordfish night attacks and carrier night cut-ins. The focus of this section will be mostly on carrier night cut-ins because they are the most varied. The former two types of carrier night attacks are simple and straightforward.

This is not to be confused with Carrier Cut-In Attacks which are for daytime shelling.