Scottish Dirk Late 18th Century

[Battara]

Here are the engravings on the front and back of the silver mounts of the hilt and scabbard. The name: "J McLeod". There is a crown stamp and the pictures of cannons, battle flags, and swords, and spears indicate to me that this person was also an officer in the British military.

My 2 questions:

1. Does the presence of cannons indicate being part of an artillery unit?

2. What does "RB 2" mean?


Other comments welcomed as well.