They tell hamlet.
The soldiers want to tell about the ghost to scare you.
guard
Hamlet
As it was a castle (or somewhat like one) and the King resided inside, it would be reasonable for there to be guards posted to protect the castle from any intruders. This was common practice and is nothing unusual.
344,346 soldiers
The popular name for the monarch's guard soldiers at the Tower of London
soldiers are some type of guard that protects people.
The National Guard was the direct response to the king's continued accumlation of soldiers.
The home guard or the national guard.
to guard
Over 1,000,000 soldiers serve collectively in the Active Army, Army Reserve and Army National Guard.