Jamieson, Fausset & Brown, on Judg 8:9

“He said therefore to them also: When I shall return a conqueror in peace, I will destroy this tower.”

“he spake . . ., When I come again in peace, I will break down this tower--Intent on the pursuit, and afraid of losing time, he postponed the merited vengeance till his return. His confident anticipation of a triumphant return evinces the strength of his faith; and his specific threat was probably provoked by some proud and presumptuous boast, that in their lofty watchtower the Penuelites would set him at defiance.”

Imported from an open dataset — not yet checked against the printed edition.