It took time to organise the British troops already in India into field forces, but eventually two columns left Meerut and Simla. They proceeded slowly towards Delhi and fought, killed, and hanged numerous Indians along the way. Two months after the first outbreak of rebellion at Meerut, the two forces met near Karnal. The combined force, including two Gurkha units serving in the Bengal Army under contract from the Kingdom of Nepal, fought the rebels' main army at Badli-ke-Serai and drove them back to Delhi.