Siege of Phitsanulok Nemyo Thihapate and Thado Mindin, with a combined force of 15,000 men, marched Burmese forces from Chiang Saen to attack Chiang Mai. When the two
Chaophrayas arrived at Chiang Mai to reinforce, Nemyo Thihapate and Thado Mindin retreated from Chiang Mai. The Burmese invasion of Chiang Mai served as a decoy to attract the Siamese attention to Chiang Mai while Maha Thiha Thira was marching into Northern Siam. Northern Siam was left less defended when the Burmese general entered from Mae Lamao Pass. The governors of Tak and Kamphaengphet, due to their inferior manpower, decided to abandon their cities and took their inhabitants to seek shelter in the forests. Maha Thiha Thura quickly took Sawankhalok and Sukhothai in October 1775. Chakri and Surasi at Chiang Mai, upon learning of the Burmese invasion at their back, marched their armies to return to Sukhothai with great haste. Maha Thiha Thura rested his armies at
Kongthani, about twenty kilometers to the east of Sukhothai, to gather food and resources. Chakri decided to return to Phitsanulok to set up defenses while his younger brother Surasi intended to face the Burmese. Surasi and Phraya Sukhothai the governor of Sukhothai faced the Burmese in the
Battle of Kongthani in October 1775. The Burmese prevailed and Surasi retreated to Phitsanulok. Maha Thiha Thura stayed at Kongthani for two months to gather resources while
Chaophrayas Chakri and Surasi established the defenses at Phitsanulok. Maha Thiha Thura left 5,000 men of his forces at Kongthani as rearguard and marched the main armies of 30,000 men to lay siege on Phitsanulok in December 1775. Maha Thiha Thura also sent some of his forces to attack
Phichai.
Chaophrayas Chakri and Surasi personally led the Siamese forces to assault on Burmese lines to break the encirclement many times but did not succeed. The Burmese vanguard was particularly armed with
flintlock muskets.
Taksin at Pakphing King Taksin learned about the Burmese invasion in January 1776. He went to ask Satpagyon Bo, the Burmese captive general, that whether he would serve and march against the invading Burmese. Satpagyon Bo denied, saying that he was too ashamed to face his own former comrades. Taksin then realized that the loyalty and submission of the captured Burmese generals from the Bangkaeo campaign were not genuine. They might insurrect if the royal capital of Thonburi was left thinly-defended. King Taksin then had Satpagyon Bo, together with other Burmese captured generals and the remaining followers of Chao Phra Fang executed to ensure the security of Thonburi. King Taksin ordered his nephew Prince Anurak Songkhram to go south and station at
Phetchaburi against possible Burmese incursions from the
Singkhon Pass. On January 16, 1776, King Taksin left Thonburi with his royal riverine fleet of 12,270 men to the north. He assigned his Chinese general
Chen Lian to station the Chinese regiment at
Nakhon Sawan to guard the royal supply line from Thonburi. Taksin reached Pakphing on January 27, about twenty kilometers to the south of Phitsanulok. Pakphing was a strategic position as it was at the mouth of Phing canal that connected
Yom River of Sukhothai and
Nan River of Phitsanulok – an important line of communications between the two cities. King Taksin established a twenty-kilometer defense line from Pakphing to the besieging Burmese at Phitsanulok on the east bank of Nan river, while the Burmese occupied mainly on the west bank. As soon as the Siamese had established their defense line, the Burmese from the west bank crossed the Nan river to attack the Siamese camps on the east bank several times. The Burmese outnumbered the Siamese forces, with 30,000 men strong on the Burmese side while Siam had 20,000 men.
Chaophraya Nakhon Sawan at
Wat Chan took charge of penetrating the Burmese siege from the south to relieve Phitsanulok. The two
Chaophrayas attacked the Burmese from inside of Phitsanulok while Nakhon Sawan attacked from outside in cooperation but did not succeed. King Taksin decided to outflank the Burmese on the west bank by diverting the forces of Chaophraya Nakhon Sawan to attack the Burmese from the rear. Nakhon Sawan attempted in many maneuvers to outflank the Burmese on the west bank but failed.
Disruption of Siamese supply line The war then reached an uneasy stalemate. While the Burmese stood strong in their besieging of Phitsanulok, they were unable to take the city with ease. The Siamese focused on their breaking of Burmese siege and attacking the Burmese from the rear but without fruitful results. Maha Thiha Thira broke this stalemate by ordering his rearguard at Kongthani to march south to attack Siamese supply line at Nakhon Sawan. Phraya Sukhothai noticed the Burmese movements and reported to King Taksin on February 10. Taksin then realized that the Burmese might try to disrupt his supply lines and sent Binnya Sein to bring the Mon regiment to Kamphaegphet to see that whether the Burmese from Kongthani came in that direction. Binnya Sein met the Burmese at Kamphaengphet and engaged, leading to the
Battle of Kamphaengphet on February 16, 1776. Even though Binnya Sein prevailed, the Burmese were able to encamped at Kamphaengphet and went on to attack and burn down
Uthaithani. King Taksin shifted more forces from the Nan river defense line at Pakphing to guard the supply lines at Nakhon Sawan and
Pho Prathap Chang. King Taksin faced the dilemma of conducting war on two fronts: both at Phitsanulok and at Uthaithani. Also, on February 16, reported came from the south that the Burmese forces from
Mergui had gone through the Singkhon pass to successfully burn down
Kuiburi and
Pranburi. Prince Anurak Songkhram guarded against the Burmese at Phetchaburi.
Battle of Pakphing Both the Burmese and the Siamese suffered from food supply shortages. The promised supply from Chiang Saen did not come to the Burmese. The Burmese were still able to gather food from the wild while the Siamese were restricted to the supplies in Phitsanulok and from Thonburi. As of March 1776, King Taksin decided to adopt more defensive, less offensive strategy. On February 18, Taksin summoned
Chaophrayas Chakri and Surasi to meet him. Chakri had been ill and only Surasi visited the king. Taksin told Surasi that he was planning to move the royal base to Nakhon Sawan to protect the supply line and to wait for Maha Thiha Thura to run out of his resources. As King Taksin had shifted his forces from the defense line to the west bank of Nan river and to guard the supply line, he unintentionally spread his forces thin. Maha Thiha Thura took this opportunity. On February 29, the Burmese surprisingly assaulted from the west bank to successfully gain a foothold at
Wat Phrik, the first Burmese holding on the east bank. The loss at Wat Phrik was a major setback for the Siamese as the Burmese managed to break the defense line. King Taksin was greatly alarmed by this incident that he ordered nearly all survivors from Wat Phrik executed. Next day, on March 1, Chaophraya Nakhon Sawan urged the Siamese king to withdraw all Siamese troops from west bank to the east to deal with the Burmese at Wat Phrik as the Siamese defense line itself on the east bank risked being outflanked by the Burmese. The defensive forces in Phitsanulok began to run out of food. King Taksin ordered the royal food supply from Pakphing, guarded by a royal force, to be delivered to Phitsanulok. However, the Burmese general Pakan Bo made sure the Siamese could not connect to send supplies. Pakan Bo attacked Siamese food cargoes and the Siamese were unable to relieve Phitsanulok with food supplies. The situation in Phitsanulok became deteriorated for the Siamese. Maha Thiha Thura eventually marched to face King Taksin himself at Pakphing in late February 1776, leading to the
Battle of Pakphing. The Siamese royal forces was outmaneuvered by the Burmese. King Taksin then decided to retreat from Pakphing down south to
Phichit on March 14, 1776. The whole defense line on the east bank of Nan river collapsed and retreated along with the king to Phichit.
Fall of Phitsanulok , the administrative center of Northern Siam, was completely destroyed by the Burmese in March 1776. All buildings and temples were burnt down with the exception of
Wat Phra Mahathat (shown here in the photo). As the Siamese at Pakphing were defeated and retreated to Phichit, Phitsanulok was left isolated. Maha Thiha Thura was free to concentrate his forces on Phitsanulok as he was required to finish the war before his resources ran out. The Siamese in Phitsanulok were in a very dire condition as their food provisions depleted. Chakri and Surasi were unable to hold the city of Phitsanulok any longer. Upon learning that King Taksin had moved to Phichit, the two
Chaophrayas decided to plan for the evacuation of Phitsanulok. King Taksin had earlier granted the permission to abandon Phitsanulok in case of inevitability. Chakri and Surasi withdrew all Siamese troops from outside Phitsanulok into the city and the Burmese attacked the city wall. The two
Chaophrayas collected the inhabitants of Phitsanulok and led the vanguard troops with the inhabitants, who were all armed including women, in the middle to stage an all-out attack on the Burmese on the east side of Phitsanulok to break free. The Burmese resisted strongly but eventually gave way for the Siamese. On March 15, 1776,
Chaophrayas Chakri and Surasi managed to break free from the Burmese at Phisanulok and regrouped at
Banmung and
Chomphu to the east of Phitsanulok. The inhabitants of Phitsanulok either fled to
Phetchabun, Phichit, took refuge in the forests or captured by the Burmese. Maha Thiha Thura eventually took Phitsanulok. Phitsanulok, which had been the political center of Northern Siam since the fifteenth century, was utterly and completely destroyed on this occasion. The Burmese set the city ablaze as shining as daylight. All buildings, palaces and temples in Phitsanulok were burnt down and destroyed with only
Wat Phra Mahathat left standing. The Burmese gathered Siamese valuables and people from Phitsanulok to be sent to Burma. == Burmese retreat and Siamese counter-offensives (May- September 1776) ==