He was the uncle of Raimondo Montecuccoli, who started his own military career under Ernesto's command.
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Count Ernesto Montecuccoli (died 1633) was a General in the service of the Holy Roman Empire during the Thirty Years War, a member of the prominent Italian Montecuccoli Family.
On 16 August of the same year, Montecuccoli's forces were defeated in the Battle of Wiesloch by a Swedish army led by Count Gustav Horn.
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In 1632, troops under Montecuccoli's command burned down the town of Knittlingen.