Talk:Spring 2015 Event/@comment-24702213-20150427005143/@comment-122.152.131.50-20150427005357

From what I read, its a 3 stage ship lock:

"第3作戦海域：【ベーグル湾通商破壊戦】に使用した戦力は、第4作戦海域の「甲」及び「乙」作戦に投入できません"

E-3 ships cannot be used for E-4 for medium and hard.