. . . . . . . . . "siege of Chencang" . "Unknown" . "40,000-50,000" . . . "China" . . . . . "invade the Wei fortress" . . . . "Cao Wei" . . . . "a previous failed attempt to capture Chencang" . . . "second Northern Expedition" . . "Shu Han" . . . . "1,000" . "Siege of Chencang" . "Siege of Chencang" . . "Chencang" . "Wei victory." . .