What was Croatia's involvement in World War 1?

At that time Croatia was not an independent state it was still part of the Astro-Hun garian Empire which also controlled what is now Slovenia,Slovakia,Czechoslovakia,parts of Ukraine,parts of Italy,Poland and parts of

Romania.Astro-Hungary fought on the side of the Central Powers along side Germany,

the Kindom of Bulgaria,and the Ottoman Empire(Turkey).So,Croatia since it was part of Astro-Hungary did fight on the Central Powers side against the Allies.