On 20 November 1971, the Indian Army moved 14 Punjab Battalion, of the 45th Cavalry regiment, into Garibpur, a strategically important town in East Pakistan, near India's border, and successfully captured it. The following day, more clashes took place between Indian and Pakistani forces. Wary of India's growing involvement in the Bengali rebellion, the Pakistan Air Force (PAF) launched a preemptive strike on 10 Indian air bases—at Srinagar, Jammu, Pathankot, Amritsar, Agra, Adampur, Jodhpur, Jaisalmer, Uttarlai, and Sirsa—at 17:45 hours on 3 December. However, this aerial offensive failed to accomplish its objectives, and gave India an excuse to declare a full-scale war against Pakistan the same day. By midnight, the Indian Army, accompanied by the Indian Air Force, launched a major three-pronged assault into East Pakistan. The Indian Army won several battles on the eastern front including the decisive Battle of Hilli. The operation also included a battalion-level airborne operation on Tangail, which resulted in the capitulation of all resistance within five days. India's massive early gains were attributed largely to the speed and flexibility with which Indian armoured divisions moved across East Pakistan.