An integrated combustor nozzle for a segmented annular combustor, the integrated combustor nozzle comprising: an inner liner segment; an outer liner segment radially spaced from the inner liner segment; a fuel injection panel extending radially between the inner liner segment and the outer liner segment, the fuel injection panel comprising a pressure side wall and a suction side wall, the pressure side wall and the suction side wall defining a cavity therebetween and intersecting at a downstream end of the fuel injection panel to define a turbine nozzle portion; and a fluid mixing assembly disposed in the cavity between the pressure side wall and the suction side wall, the fluid mixing assembly comprising a first radially oriented array of fluid mixing apparatuses, wherein each fluid mixing apparatus comprises; a first annular wall defining a first passage for putting into fluid communication with a source of a first fluid at a first pressure; a second wall defining a first plenum for putting into fluid communication with a source of a second fluid at a second pressure, wherein the first pressure is less than the second pressure; a third wall defining a second plenum for putting into fluid communication with a source of a third fluid, wherein the third wall is at least partially surrounded by the second wall; a mixing conduit extending through the second plenum and fluidly connecting the first plenum and the first passage, the mixing conduit defining at least one injection hole in fluid communication with the second plenum; wherein a flow of the second fluid through the mixing conduit entrains, in use, a flow of the third fluid from the at least one injection hole to produce, in use, a premixture of the second fluid and the third fluid; wherein the mixing conduit conveys, in use, the premixture into the first passage; and wherein, within the first passage, the premixture draws, in use, a flow of the first fluid into and through the first passage to produce, in use, a mixture of the first fluid, the second fluid, and the third fluid and wherein the mixture of the first fluid, the second fluid, and the third fluid is directed, in use, in a substantially circumferential direction relative to a centerline of the segmented annular combustor. an inner liner segment; an outer liner segment radially spaced from the inner liner segment; a fuel injection panel extending radially between the inner liner segment and the outer liner segment, the fuel injection panel comprising a pressure side wall and a suction side wall, the pressure side wall and the suction side wall defining a cavity therebetween and intersecting at a downstream end of the fuel injection panel to define a turbine nozzle portion; and a fluid mixing assembly disposed in the cavity between the pressure side wall and the suction side wall, the fluid mixing assembly comprising a first radially oriented array of fluid mixing apparatuses, wherein each fluid mixing apparatus comprises; a first annular wall defining a first passage for putting into fluid communication with a source of a first fluid at a first pressure; a second wall defining a first plenum for putting into fluid communication with a source of a second fluid at a second pressure, wherein the first pressure is less than the second pressure; a third wall defining a second plenum for putting into fluid communication with a source of a third fluid, wherein the third wall is at least partially surrounded by the second wall; a mixing conduit extending through the second plenum and fluidly connecting the first plenum and the first passage, the mixing conduit defining at least one injection hole in fluid communication with the second plenum; wherein a flow of the second fluid through the mixing conduit entrains, in use, a flow of the third fluid from the at least one injection hole to produce, in use, a premixture of the second fluid and the third fluid; wherein the mixing conduit conveys, in use, the premixture into the first passage; and wherein, within the first passage, the premixture draws, in use, a flow of the first fluid into and through the first passage to produce, in use, a mixture of the first fluid, the second fluid, and the third fluid and wherein the mixture of the first fluid, the second fluid, and the third fluid is directed, in use, in a substantially circumferential direction relative to a centerline of the segmented annular combustor.