Datuk Admiral Raja Dilaut who guarded the coast and the sea from Bengkalis to Rokan (included in the Siak region), since the 18th century has several mainstay warships, where the commando ship was named Ketam Batu. If you see from the replicas of various ships used (source: American National Museum, 1923), this ship called "Lanchang" is not too big in size. Has a length of about 15m, with 2 lela cannon in front and 2 behind. There are 2 masts and there are holes for oars on the left / right. Here there is also the ship "Banting" which is called by Europeans as The Flying Roa (flying boat) because it is very fast and agile. All of which were once used as a fleet of war, when fighting the VOC or Britain, and war with Lanun or when conquering other kingdoms. The size of the ship like this is very advantageous in the narrow strait fighting, after attacking, these ships immediately disappear into the nearby rivers and disappear undetected. Meanwhile, if the war in the open sea, siege patterns are used. One of the victims was the Dutch ship "Man O War" which was lost at Tanjung Jati (between Rupat & Bengkalis), which was the territory of Datuk Laksamana and his father-in-law in the Pengulu Dumai.
