To start off i searched for march of the giants and rune of command and didnt see anything.
While questing in Howling Fjord i read atleast 8-10 people LFG for the quest Quest: March of the Giants - Thottbot: World of Warcraft . well i finaly got to it and after a couple of tries i died to them solo. So i proceeded to go to another quest Quest: The Rune of Command - Thottbot: World of Warcraft . Its from the same area. Well the pet you get from that quest has a 5 minute duration and you can get him again. Simply get the pet and go do March of the giants yourself. The pet has a really nice stun ability which makes it quite easy. Also you can use him again to help with Quest: Demolishing Megalith - Thottbot: World of Warcraft .
Sorry if this is common sense or a repost. Just hoped to help some people who want to do the quest. Wonder what the pet would do in a pvp situation hmm