Wat Chumphon, or the Monastery of Concentration of Troops, was situated off the city island in the northern area of Ayutthaya in the Hua Ro Sub-district. The brick mound is located on the west bank of the new Lopburi River. Khlong Daeng, a canal linking the old and the new Lopburi River, ran on its northern side. Wat Chedi Daeng was west and Wat Si Fan south.
The mound, which contains some old bricks and traces of Buddha images, is positioned next to an electrical tower and a Ficus Religiosa or Bodhi tree.
Historical data about the monastery and its construction is unknown. Still, the name of the monastery, situated close to Phaniat, let us presume that it was once a gathering area for troops before going into battle.
In the Royal Chronicles of Ayutthaya, we find indications that armies were readied in its vicinity. King Chakkraphat (reign 1548-1569 CE) ordered the gathering of troops in 1551 CE to attack Lovek, the capital of the Khmers.
"In 894, a year of the dragon, fourth of the decade, King Cakkraphat, hearing reports that the government of Hongsawadi was at peace, ordered that an army of fifty thousand be readied at Phaniat and that a naval force be conscripted from among the cities of the south. He appointed Phraya Yao to be the commander-in-chief and Phra Si Chodük to be the commander of the vanguard." [1]