sentences:  The kingdom engaged frequently in conflict with Burma, and many of these samurai soldiers served the court in battle.The kings also engaged in formal relations with the Tokugawa shōguns, receiving shipments of arms and munitions among many other trade items.By the 1620s, Japan was Ayutthaya's most major trading partner, as over twenty Japanese merchant houses, along with many independent adventurers and traders, engaged in commercial shipping between Ayutthaya and Nagasaki every year.