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Yosegaki Hinomaru

There is only one slogan ??(illegible)武運 above a signature at the lower left corner other than 祈武運長久 at the right end of the flag. The rest are all signatures.
 
Looks like its all names.
Oops, Toritoribe-san beat me to it. And he also picked out a phrase I missed.
 
Hello Toritoribe

Please, could you help me with the translation of these slogans:


 
一撃轟沈
Sink (the enemy's ships) by a single fire

自発態動
(most likely a miswriting of 自発能動 voluntary, active)
 
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