A combustor for a gas turbine engine (20;200), comprising: a forward assembly comprising a bulkhead assembly and a multiple of swirlers , each of the swirlers circumferentially aligned with one of a multiple of fuel nozzles ; an outer combustor wall assembly including an outer support shell and an outer aft liner panel ; and an inner combustor wall assembly including an inner support shell and an inner aft liner panel , each liner panel comprising: a forward region including a multiple of first effusion passages each directed at an orientation parallel to a circumferential rail ; and an aft region aft of the forward region ; wherein: the forward region is forward of a multiple of dilution passages (116;116A,B) along a circumferential line (W); the aft region includes a multiple of second effusion passages each directed at an orientation transverse to the multiple of first effusion passages within the forward region ; and the aft region extends forward of the dilution passages (116;116A,B), wherein at least one of the swirlers is configured such that air emanating from each swirler establishes, in use, a first local swirl direction (f) in the vicinity of the outer aft liner panel that is opposite a second local swirl direction (f') in the vicinity of the inner aft liner panel ; characterised in that the multiple of first effusion passages of each liner panel have an orientation consistent with a respective one of the first and second local swirl directions (f,f'). a forward assembly comprising a bulkhead assembly and a multiple of swirlers , each of the swirlers circumferentially aligned with one of a multiple of fuel nozzles ; an outer combustor wall assembly including an outer support shell and an outer aft liner panel ; and an inner combustor wall assembly including an inner support shell and an inner aft liner panel , each liner panel comprising: a forward region including a multiple of first effusion passages each directed at an orientation parallel to a circumferential rail ; and an aft region aft of the forward region ; a forward region including a multiple of first effusion passages each directed at an orientation parallel to a circumferential rail ; and an aft region aft of the forward region ; wherein: the forward region is forward of a multiple of dilution passages (116;116A,B) along a circumferential line (W); the aft region includes a multiple of second effusion passages each directed at an orientation transverse to the multiple of first effusion passages within the forward region ; and the aft region extends forward of the dilution passages (116;116A,B), wherein the forward region is forward of a multiple of dilution passages (116;116A,B) along a circumferential line (W); the aft region includes a multiple of second effusion passages each directed at an orientation transverse to the multiple of first effusion passages within the forward region ; and the aft region extends forward of the dilution passages (116;116A,B), wherein at least one of the swirlers is configured such that air emanating from each swirler establishes, in use, a first local swirl direction (f) in the vicinity of the outer aft liner panel that is opposite a second local swirl direction (f') in the vicinity of the inner aft liner panel ; characterised in that the multiple of first effusion passages of each liner panel have an orientation consistent with a respective one of the first and second local swirl directions (f,f'). <EOS>