Brotherhood has become the fast-selling launch in the Assassin's Creed series, landing in second place in the UK charts in its first week - 63,000 units behind Call of Duty: Black Ops.
While Activision's shooter kept Ubisoft's action game at bay, Chart-Track statements reveal it saw an 85 per cent decline in sales in its second week of availability.
Given the game is known to have sold two million copies in its first five days at UK retail, a decline to 15 per cent of that figure would seem to put its second week sales somewhere in the region of 300,000 (dependent on the sales on day six and seven of the first week).
Brotherhood is thus likely to have shifted North of 200,000 copies for Ubisoft in the UK alone.
This follows speculation by Activision execs and analysts that Black Ops might not ultimately best the sales records set by its predecessor, Modern Warfare 2.
Brotherhood, meanwhile, saw a 55 to 45 per cent split between Xbox 360 and PlayStation 3 sales.
Last week's full UK charts, which otherwise see a Nintendo dominance of the top 10, are available here.