We have made provision against surprised attack.

上句有误。surprised 应改为 surprise。surprise attack= 突然袭击。

此时，surprise 有的词典认为是名词，有的词典认为是形容词。

《韦氏高阶》adjective

always used before a noun

: not expected : causing a feeling of surprise

• a surprise best seller/success

• She made a surprise announcement/appearance at the concert.

《牛津》noun

an event, a piece of news, etc. that is unexpected or that happens suddenly

a surprise attack