At least 553 people are said to have died in a month of fighting for Kobane, the Kurdish town just inside Syria under Islamic State (IS) attack.
The Syrian Observatory for Human Rights, a UK-based Syrian opposition body which monitors the conflict, counted 298 IS fighters among the dead.
US aircraft have bombed IS positions as Kurdish fighters cling on to the town's vital border crossing with Turkey.
But the defenders say they are outgunned on the ground.
"The supply of fighters is very good..." Kobane official Idris Nassan told Reuters news agency. "But fighters coming without arms, without weaponry, is not going to make a critical difference."