Set during the Blitz, a pacifist Air Raid Warden fights to keep his community safe against the merciless Luftwaffe.

Hi WARRIN88

A pilot / air raid warden fights against the Luftwaffe / German air force during an air strike aimed to ..........
OR
A pilot / air raid warden guards his people by thwarting the merciless Luftwaffe / Germany's air force attempt to ............... by an airstrike.

Use this as a template if you think I got your story right and re-write. I suggest using widely understood terms in your logline.

I hope this helps.