Pa Mok was apparently in a strategic position because it was located near the confluence of a canal connecting the present Noi and Chao Phraya Rivers. Armies were used to establish their camps in this area during warfare.
It is said that King Naresuan (reign 1590-1605 CE) visited this temple to pay homage to the reclining Buddha of Pa Mok before going into battle with the Maha Uparacha of Burma - Minchit Sra - in 1592 CE. Still, I found no trace of such a record in Cushman's English translation of the Royal Chronicles of Ayutthaya. This battle is known as the "Battle of Nong Sarai" or the "Elephant Battle" (Yuddhahatthi). (2)
We read that Prince Naresuan established a military camp at Pa Mok and, during the night, got a prophetic dream in which he fought with an enormous crocodile on the flooded west side of Pa Mok and killed the beast. The Brahmins prophesied a victory for the king. A painting recalling this story can be found in the prayer hall of Wat Suwan Dararam. The story continues that when the prince mounted his elephant, he saw a relic of the Buddha, the size of an orange, appearing in the skies from the south to the west, and he prayed that he might be victorious in battle (3).
"At ten thum, the King dreamt a prophetic dream that a spate of waters flooded the forest to the west, that he went wading around in the water and met a large alligator, that they fought and that the King killed the alligator. When he awoke, the King immediately ordered the astrologers to interpret. Phra Horathibòdi prophesied, “This time, the armies are enormous and the fighting will culminate in a great elephant battle. Your Majesty, however, will be victorious, wading in pursuit of and killing Your adversaries and enemies just as in the dream You went wading around through the flowing water.” The King listened and was delighted. Having completed donning the ornaments reserved for royal battle, he proceeded to the platform for mounting elephants to await the auspicious moment and beheld a Great Holy Relic of the Buddha the size of a Seville orange perform a miracle by advancing from the south, rotating clockwise and passing on to the north. His Majesty was completely suffused with joy, raised his hands in veneration with his ten fingers joined together, and prayed for [the relic’s] blessing for victory against his adversaries." [3]