What does せり mean in 「ワレ奇襲【きしゅう】ニ成功【せいこう】セリ」?
We succeeded in our surprise attack.
https://ja.wikipedia.org/wiki/トラトラトラ
I get the following vocabulary:
我【われ】 we
奇襲【きしゅう】 surprise attack
に particle
成功 【せいこう】 success
but I don't understand what the セリ does at the end.