The three brothers distinguished themselves in the first war with the Mongols. In 1285, the three brothers, still in their twenties, came to lead the defense of Central Burma. The army had been defeated in northern Burma by the Mongols in the previous dry-seasons (1283–85). Over the next two years, they manned the front (north of present-day Mandalay) while the king and his court relocated to Lower Burma. It was probably during this period that the brothers were given the official titles of Athinkhaya, Yazathingyan and Thihathu by which they would be known in history. They made their name in 1287 when the Mongols invaded Central Burma once again. The invasion was in response to the July 1287 assassination of Narathihapate, who became a Mongol vassal six months earlier. The Burmese army led by the brothers successfully stopped the Mongols, who after taking heavy casualties retreated to their base in Tagaung.