The British did not take Mirza's successes lightly, and sent Captain Edward Noel to assassinate Mirza. The British captain was arrested before he could take any such action. Colonel Stokes and General Lionel Dunsterville (whose troops were lightly referred to as Dunsterforce) were further agitated by Mirza's refusal to let British troops pass through Gilan on their way up north, while Mirza had approved and guaranteed Russian troops returning north safe passage. British forces attacked Rasht as a result, and even bombed Mirza's residence using airplanes. An ultimatum was issued to Mirza by the British to surrender.