For one of the Dailys in the Argent Crusade; A Valiant's Field Training - (10 Converted Heroes Slain). You have a few different areas as the quest areas. Well after days of trying to find them i was successful. There is only one area I found them in, the coords as follows:
38.7 - 56.0
41.2 - 45.1
47.1 - 56.4
40.9 - 58.6
This radius is the only area i could find these heroes so u may want to up date for future reference when u bring the new update out.