In Lee's Surrender what happened that lead to the surrender

In short:

The Confederate Army’s retreat moved southwest along the Richmond & Danville Railroad. Lee desperately sought a train loaded with supplies for his troops but encountered none.

Grant, realizing that Lee's army was running out of options, sent a letter to Lee on April 7 requesting the Confederate general's surrender.

Explanation:

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When the confederate army retreated, they kept on moving southwest. Lee realized that there were no trains with supplies for the army. Grant found out and wrote a letter to Lee asking the army to surrender. This is how the army was lead to surrender.

Explanation:

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