On 23 April 1945, the hunter-killer group, operating as a combined force against a large <e1>wolfpack</e1> of <e2>U-boats</e2>, spotted a partially submerged submarine but could not locate it after it dived.
On 23 April 1945,
On 23 April 1945, the hunter-killer group, operating as a combined force against a large wolfpack of U-boats, spotted a partially submerged submarine but could not locate it after it dived.
<triplet> wolfpack <subject> U-boats <object> Member-Collection(e2,e1)