That was a double invasion by both Angmar and Gundabad. Invasions last a
pretty long time, and can spawn up to 70 enemy units. Units spawn every
time the horn sounds, and the invasion continues until the sword
disappeares.

The floating silver coin appears when a trader NPC dies, and will re-spawn
the NPC after a random amount of time.

You need rep 300 to hire rangers of the north I think. I suggest trying to
hire the blue mountain dwarves first. Rohrric soldiers are nice, but well,
you’re pretty far from Rohan, so…
High elves are the strongest units, save the olog-hai of mordor

I suggest making custom waypoints and using them off-screen. Traveling in
middle-earth is very hard. Takes a *lot* of traveling. Get a Rorric horse
when you can. The seriously cut down the travel time.