World War 1 battle action, gangster life, a love triangle and antiwar elements combine in They Gave Him a Gun, directed by WS. Van Dyke II (The Thin Man). As the story opens, worldly-wise Fred takes naive Jimmy under his wing at boot camp, helping the gun-shy youth he calls Hayseed adapt to the army. The two friends see action in the trenches, and Jimmy uses the marksmanship he developed to wipe out enemy machine gunners. Jimmy gets med