left flank being unguarded
THE NOTE submitted by Bennigsen, and the report sent in by the Cossacks of the enemy's left flank being unguarded, were simply the last straws that showed the inevitability of giving the signal for advance, and it was arranged to advance to attack on the 5th of October.
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left flank being unguarded
左翼无人防守
以上为机器翻译结果，长、整句建议使用 人工翻译 。