By early 1995, fewer and fewer supply convoys were making it through to the enclave. The situation in Srebrenica and in other enclaves had deteriorated into lawless violence as prostitution among young Muslim girls, theft and black marketeering proliferated. The already meager resources of the civilian population dwindled further, and even the UN forces started running dangerously low on food, medicine, ammunition and fuel, eventually being forced to start patrolling the enclave on foot. Dutch soldiers who left the area on leave were not allowed to return, and their number dropped from 600 to 400 men. In March and April, the Dutch soldiers noticed a build-up of Serb forces near two of the observation posts, "OP Romeo" and "OP Quebec".