Defending the Broken Isles III

You can do Defending the Broken Isles III on a single character, during the same assault.

All you need to do is complete the Legion Assault up until the point the final quest puts you in the scenario:

- Battle for Azsuna
- Battle for Val'sharah
- Battle for Highmountain
- Battle for Stormheim

Every single time you complete the scenario, your score for this achievement goes up by 1. This means you can just abandon the quest after the scenario, fly back to where you queue for it, and redo it all over again.

Note that for many players the scenario queue is currently bugged, and that you need to enter it with a premade group of 3 people, else you'll be waiting forever. You can solo queue just fine now.

You can complete this achievement during one assault - just abandon the quest once you're done and accept it again. Repeat 10 times.

EU

Assault in Aszuna started at 09:00 and ended at 15:00 (Nov 5).
Assault in Val'sharah started 23:30 (Nov 5) and ended 05:30 (Nov 6).
Every assault lasts 6 hours, and if the gap between them is 8 hours and 30 minutes, the next assaults are:

EDIT:

• 
  
• Legion Assaults now cycle approximately 375% faster. Source
• 
  

Every assault now lasts 4 hours, and the gap between assaults is 3 hours.
Here you can find updated dates and times until end of Legion Remix.

all times are CET / Server time
December 13, 23:00 - 03:00 (Dec 14)
December 14, 06:00 - 10:00, 13:00 - 17:00, 20:00 - 00:00
December 15, 03:00 - 07:00, 10:00 - 14:00, 17:00 - 21:00
December 16, 00:00 - 04:00, 07:00 - 11:00, 14:00 - 18:00, 21:00 - 01:00 (Dec 17)
December 17, 04:00 - 08:00, 11:00 - 15:00, 18:00 - 22:00
December 18, 01:00 - 05:00, 08:00 - 12:00, 15:00 - 19:00, 22:00 - 02:00 (Dec 19)
December 19, 05:00 - 09:00, 12:00 - 16:00, 19:00 - 23:00
December 20, 02:00 - 06:00, 09:00 - 13:00, 16:00 - 20:00, 23:00 - 03:00 (Dec 21)
December 21, 06:00 - 10:00, 13:00 - 17:00, 20:00 - 00:00
December 22, 03:00 - 07:00, 10:00 - 14:00, 17:00 - 21:00
December 23, 00:00 - 04:00, 07:00 - 11:00, 14:00 - 18:00, 21:00 - 01:00 (Dec 24)
December 24, 04:00 - 08:00, 11:00 - 15:00, 18:00 - 22:00
December 25, 01:00 - 05:00, 08:00 - 12:00, 15:00 - 19:00, 22:00 - 02:00 (Dec 26)
December 26, 05:00 - 09:00, 12:00 - 16:00, 19:00 - 23:00
December 27, 02:00 - 06:00, 09:00 - 13:00, 16:00 - 20:00, 23:00 - 03:00 (Dec 28)
December 28, 06:00 - 10:00, 13:00 - 17:00, 20:00 - 00:00
December 29, 03:00 - 07:00, 10:00 - 14:00, 17:00 - 21:00
December 30, 00:00 - 04:00, 07:00 - 11:00, 14:00 - 18:00, 21:00 - 01:00 (Dec 31)
December 31, 04:00 - 08:00, 11:00 - 15:00, 18:00 - 22:00
January 1, 01:00 - 05:00, 08:00 - 12:00, 15:00 - 19:00, 22:00 - 02:00 (Jan 2)
January 2, 05:00 - 09:00, 12:00 - 16:00, 19:00 - 23:00
January 3, 02:00 - 06:00, 09:00 - 13:00, 16:00 - 20:00, 23:00 - 03:00 (Jan 4)
January 4, 06:00 - 10:00, 13:00 - 17:00, 20:00 - 00:00
January 5, 03:00 - 07:00, 10:00 - 14:00, 17:00 - 21:00
January 6, 00:00 - 04:00, 07:00 - 11:00, 14:00 - 18:00, 21:00 - 01:00 (Jan 7)
January 7, 04:00 - 08:00, 11:00 - 15:00, 18:00 - 22:00
January 8, 01:00 - 05:00, 08:00 - 12:00, 15:00 - 19:00, 22:00 - 02:00
January 9, 05:00 - 09:00, 12:00 - 16:00, 19:00 - 23:00
January 10, 02:00 - 06:00, 09:00 - 13:00, 16:00 - 20:00, 23:00 - 03:00 (Jan 11)
January 11, 06:00 - 10:00, 13:00 - 17:00, 20:00 - 00:00
January 12, 03:00 - 07:00, 10:00 - 14:00, 17:00 - 21:00
January 13, 00:00 - 04:00, 07:00 - 11:00, 14:00 - 18:00, 21:00 - 01:00
January 14, 04:00 - 08:00, 11:00 - 15:00, 18:00 - 22:00
January 15, 01:00 - 05:00, 08:00 - 12:00, 15:00 - 19:00, 22:00 - 02:00 (Jan 16)
January 16, 05:00 - 09:00, 12:00 - 16:00, 19:00 - 23:00
January 17, 02:00 - 06:00, 09:00 - 13:00, 16:00 - 20:00, 23:00 - 03:00 (Jan 18)
January 18, 06:00 - 10:00, 13:00 - 17:00, 20:00 - 00:00
January 19, 03:00 - 07:00, 10:00 - 14:00, 17:00 - 21:00
January 20, 00:00 - 04:00, 07:00 - 11:00