Spartacus creative solution

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Spartacus had been surrounded and locked by the Roman
cohorts at the top of Mount Vesuvius. A huge army stood
in front of  him and a deep chasm was behind.
The current situation suggests “only one” obvious way out
– a decisive battle.
His soldiers prepared to it through weaving shields from withes.
Strolling around the camp, a brilliant idea flashed across
Spartacus’ mind.

What did he decide?