In 1788, the Gorkhalis turned their attention north and invaded Tibet. They seized the border towns of Kyirong and Kuti, and forced the Tibetans to pay an annual tribute. When the Tibetans stopped paying it, the Gorkhalis invaded Tibet again in 1791 and plundered the Tashilhunpo Monastery in Shigatse. This time the Chinese army came to Tibet's defence and advanced close to Kathmandu but could not achieve success due to strong counterattack with khukuri. The anxious Bahadur Shah asked for 10 howitzer mountain guns from the British East India Company. Captain William Kirkpatrick arrived in Kathmandu. Eventually, the Fu Kanggan was keen to protect his army and the war being resultless was concluded by signing a peace treaty at Betrawati.