What colour was the viking long-ship flag?

Answer 1

Vikings built many different ships in many sizes, depending on the need they were to fulfill. The most common ship was the longship, which they used for warfare. These ships were long, narrow and typically brown.

Answer 2

Each tribe had its own flag, or banner. There was not any single banner that all vikings sailed under. The vikings were traders/raiders, and not a unified standing army or such thing.

Answer 3

red and white