: ▁ 2 4   cm ▁Ha ub it ze ▁ 3 9 ) ▁( How itzer ▁model ▁ 3 9 ) ▁was ▁a ▁Czech oslov ak - des igned ▁sie ge ▁how itzer ▁used ▁in ▁the ▁Second ▁World ▁War . ▁It ▁was ▁kept ▁in ▁production ▁after ▁the ▁German ▁occupation ▁of ▁Czech oslov ak ia ▁in ▁March ▁ 1 9 3 9 ▁and ▁eigh teen ▁were ▁delivered ▁to ▁the ▁Germ ans . ▁It ▁was ▁only ▁used ▁by ▁the ▁Army ' s ▁Art illery ▁Regiment ▁ 8 1 4 ▁and ▁entered ▁service ▁shortly ▁before ▁the ▁Battle ▁of ▁France ▁in ▁ 1 9 4 0 . ▁The ▁regiment ▁participated ▁Operation ▁Bar bar ossa ▁and ▁in ▁the ▁Sie ges ▁of ▁Se v ast opol ▁and ▁L ening rad . ▁ ▁Description ▁and ▁development ▁Š k oda ▁designed ▁it ▁for ▁export ▁and ▁Turkey ▁ordered ▁a ▁batch , ▁but ▁only ▁received ▁two ▁before ▁the ▁Germ ans ▁occupied ▁Czech oslov ak ia ▁in ▁March ▁ 1 9 3 9 . ▁It ▁was ▁a ▁stable mate ▁of ▁the ▁Š k oda ▁ 2 1   cm ▁Kan one ▁ 3 9 ▁and ▁used ▁virt ually ▁the ▁same ▁mount ing ▁and ▁transport ▁arrang ements . ▁It ▁used ▁an ▁interrupted ▁sc rew ▁b ree ch ▁with ▁a ▁de ▁B ange ▁obt ur ator ▁to ▁provide ▁the ▁gas ▁se al ▁with ▁bag ged ▁prop ell ant . ▁The ▁carriage ▁revol ved ▁on ▁a ▁ball - race ▁firing ▁platform ▁that ▁had ▁to ▁be ▁d ug - in ▁before ▁firing , ▁a ▁task ▁that ▁took