红军强渡大渡河。
The Red Army forced the Tadu River .
这时红军强渡了大渡河。
The Red Army then made a forced crossing of the Dadu river .
这时红军强渡了大渡河。红军的兵力有多少?
The Red Army then made a forced crossing of the Dadu River . What was the strength of the Red Army ?