Incomplete question. However, I inferred from a historical perspective.
<u>Explanation</u>:
Thomas Gage (General Thomas Gage) was is a famous British general that controlled a large portion of British soldiers in North America during the British colonial era.
His statement likely came at a time when there was large opposition coming from Boston over perceived injustices from the government. Hence, his statement meant they (those in power) were losing or not in control over Boston.
