Some interesting ancient Burmese military formations and strategies
Source: မေမြို့မိုးကြည်၏မြန်မာ့စစ်ပညာ and မြန်မာ့စွယ်စုံကျမ်း အတွဲ ၁၀
For more info: မြန်မာ့ စစ်ပညာ | PDF
Myanmar's battlefield success relied on good officers maintaining discipline and being smart since Myanmar's army is primarily composed of conscripted peasants (not much has changed lol)
Historically, due to civil wars, Myanmar tends to have veteran commanders and soldiers which made a very martial and aggressive empire.
(Eg. A strategist like Maha Thiha Thura. Some of his greatest feats include almost defeating Taksin's Thonburi with an undermanned army and encircling a bigger Chinese army)
Scorched earth tactics(မီးထင်းတိုက်) were and are still used to this day.
War elephants are also used as heavy shock troops and artillery (sort of like tanks). They equipped them with mortars(စိန်ပြောင်း) and small caliber cannons.
Elephants were protected by soldiers called ဆင်ခြေဖုံး (literally means covering elephant's legs).
In terms of weapons, you'd see ဓား sword, အဲမောင်းလှံ spear, bamboo spear(တင်ကျည်း), javelins, matchlocks, flintlocks, rectangular and circular shield.
Most common armor is the wavy iconic chest plate(ဗာလည်ကွေး). Some leather armor and a type of scale armor was used but no standardized equipment for normal troops. Some temple murals show armor that looks like Tibetan lamellar armor.
These are some wacky formations though. If anyone has more info on ancient tactics, please tell.