Call Of Duty 4 has fought off competition to retain its position at the top of the ChartTrack Xbox 360 chart.

The Activision title is followed in second once again by Ubisoft’s Assassin’s Creed, with Microsoft’s Halo 3 moving up from fourth to third.

EA’s Need For Speed: ProStreet swaps places with Halo 3 as it moves down to fourth, whilst Eidos’ Kane & Lynch: Dead Men holds steady in fifth.

The full ChartTrack Xbox 360 top ten for the week ending December 15th reads:

1) COD4: modern Warfare    Activision
2) Assassin’s Creed    Ubisoft
3) Halo 3    Microsoft
4) Need For Speed: ProStreet        EA
5) Kane & Lynch: Dead Men        Eidos
6) FIFA 08    EA
7) Mass Effect        Microsoft
8) Guitar Hero III    Activision
9) Pro Evolution Soccer 2008        Konami
10) Lego Star Wars: Complete Saga    Activision