ammunition has run out and no aid is forthcoming ? 敵軍已～，馬上包圍敵人！ The enemy troops have run out of ammunition and no aid is forthcoming.Close in on them at once!
彈盡援絕援（糧）dàn jìn yuán jué
彈藥用完了，后援也斷絕了。比喻處境十分困難。the ammunition is gone, and reinforement is nowhere in sight, ammunition has run out and no aid is forthcoming, run short of ammunition and food