Hi,
Just to let you know that I found a quicker and easier way to do this. Ive also put the video link to show visual on it.
When you start the level jump of the platform you are on, and move to the right hand side behind the barrels.
1. Kill the two archers on the right (take two hits each - switch between them both after each hit as its quicker)
2. Then focus on the opposite side. There are about 6 guys - but you only need to focus on the END TWO/THREE, the others only attack you - so use the barrels to sheild from them & kill the end two twice.
After that you will need to be quick and run out and grab more spears (from either the other side of the barrels (two) or to the stash further out) and then focus again on the right hand side - left soilder and the top guy are the main two but you need to kill all 3 - again two hits each.
3. You will then get the FIRE VOLLEY sign - use kinect for quickness or run and hide in a corner while pressing R1 for FIRE VOLLEY
This is by far the most annoyingly frustrating part of the game on Legendary setting, the rest is fine, but this is by far the easiest way to do it.
The other guide makes you kill them all - BUT YOU DONT HAVE TO, TO REACH THE CHECKPOINT........
Enjoy - this is my first solution so let me know if it helps!
My GT: Stavrosmct on xboxone
Video: