Person forcefully seized my land not vacating even after orders

sir,i used to live in pagambarpur,which is situated in chapra district, In my vllage a person has seized my land forcefully and cultivating my land . due to that we had registered an FIR in police station after that we had filed a case on him,but inspite of having degree on that case from court he is not ready to leave our land plot. and he is working as a staff in that police station .so ,please suggest me way ,such that we may get our land plots back?....