Time to talk a bit about event special setup... basically the Combination Fleet which is required for some maps:
What it is is basically a fleet being 2 fleets combined so 12 ships battle instead of normal 6, what you need to do is go to your 2nd fleet on click and drag the 2 Flag into 1 Flag
A window for combination fleet will show up and there's 2 type of combination fleet you can choose: Mobile(Blue) or Surface(Green)
Both have specific composition requirements and will give you notice if your composition does not match: (Screenshot saying need at least 2 CV and can't have more than 3 BB).
If everything is good, no message will show up:
Combination Fleet have 4 types of formation, not gonna go through details, but it is basically 1. anti sub, 2. defensive, 3. anti air, 4. attack. from top left to bottom right.
The 2 type of combination fleet is slightly different, Mobile focus on Aircraft Carriers and Surface focus on Battleships in terms of composition. In terms of attack, Mobile have the 2nd fleet (the front line) attack first, while Surface have the 1st fleet (the back line) attack first. Only front line will enter night battles and for day battle front line will only have 1 attack phase regardless there are battleship or not.
In addition to that, some other mechanics to keep in mind: combination fleet reduce hit rate, so you tend to miss more, don't equip over-sized guns on ships. 2nd fleet flagship will not sink if it gets heavy damaged. You cannot use submarine as 2nd fleet flagship.
Rare drop so far from event in E-1:
=M= currently pushing E-2 for Katsuragi =w=/