With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: They were often communally owned by coastal farmers or commissioned by kings in times of conflict, in order to quickly assemble a large and powerful naval force. While longships were used by the Norse in warfare they were used as warships, and not as troop transports during raids. In the tenth century, longships would sometimes be tied together in offshore battles to form a steady platform for infantry warfare. During the 9th century peak of the Viking expansion, large fleets set out to attack the degrading Frankish empire by attacking up navigable rivers such as the Seine. Rouen was sacked in 841, the year after the death of Louis the Pious, a son of Charlemagne. Quentovic, near modern Étaples, was attacked in 842 and 600 Danish ships attacked Hamburg in 845. In the same year, 129 ships returned to attack up the Seine. They were called "dragonships" by enemies such as the English because they had a dragon-shaped bow. The Norse had a strong sense of naval architecture, and during the early medieval period they were advanced for their time.
text_B: Is it reasonable to assume that Viking longships were fitted with battering rams or even early cannons, depending on what would be used in naval battles at this time in history?
YES.