After the rebellion was 'put down' the leaders fled into Jebel Akhdar (The Green Mountain) and continued to launch intermittent attacks from their safe vantage point. Walker was then sent in command of two groups to deal with the rebels. On 27 December, Walker gained a lodgment on the north side of the Jebel and climbed a rope which they had fixed to the rock face, steadying himself in a cleft in the rock, Walker pulled the pin from a grenade and hurled it over the lip above him. It killed one of the enemy and scattered the rest. Walker and his men then reached the plateau and by dawn they had killed another eight. Walker was later awarded the Military Cross for his bravery.