I have finished this chain quest, I believe you need more that the 3 players as suggested by the quest log, because the Path of Conquest is packed with Blood Elves (casters and tanks) and elites giants that you can easily aggro and wipe in a second. There are also roaming mounted elves (the cavaliers on horses and on the bird) that can be trouble, consider the river as a route scape because you can wipe more than 3 times and prolong this quest making it boring. Potions, bandages and food can easy your stay. Be aware also that along the path that run west to east, elites mounted elves are present and can stop from time to time close to the road where Path of Conquest is. Everything you need is situated east of Eclipse point, and south/west of it for the final quest. Do not forget to use the flare gun that the NPC gave u at the beginning to call him and report each time you complete a quest in this chain; only the last quest requires you to run back at the dwarf keep.
If you want to finish this quest fast and with little or no deaths, make a full 5 man group, it is easier if you have a flying mount because you can zip back and forth to complete it faster.