A combustor comprising: at least one fuel nozzle; a cap assembly extending generally radially and axially within at least a portion of the combustor and least partially surrounding at least some of the one or more fuel nozzles; wherein the cap comprises a first shroud that extends circumferentially inside the combustor, wherein the first shroud defines at least one inlet passage; a second shroud that extends circumferentially inside the combustor, the second shroud axially separated from the first shroud, wherein the second shroud defines at least one outlet passage; a first plate that extends radially inside the second shroud downstream from the at least one inlet passage of the first shroud and upstream from the at least one outlet passage of the second shroud, wherein the first plate defines at least one inlet port,at least one outlet port extending axially therethrough; a second plate that extends radially around the first plate downstream from the at least one inlet port and upstream from the at least one outlet port; a first fluid flow path from the at least one inlet passage to the at least one inlet port; a second fluid flow path from the at least one outlet port to the at least one outlet passage; and a baffle that extends from the first shroud to the first plate, wherein the baffle separates the first fluid flow path from the second fluid flow path, a sleeve that circumferentially surrounds at least a portion of the second shroud to define a first annular passage between the second shroud and the sleeve, wherein the at least one outlet passage provides fluid communication between the first annular passage and an outlet plenum of the cap at least partially defined by the first plate, the second shroud and the baffle through the second shroud; and a casing that circumferentially surrounds at least a portion of the sleeve to define an outer annular passage between the casing and the sleeve, the outer annular passage providing fluid communication between at least one of a compressor discharge plenum a compressor and an external cooling medium supply and the at least one inlet passage, wherein the at least one inlet passage provides fluid communication from the outer annular passage through the first shroud into an inlet plenum of the cap assembly defined by the first shroud, the baffle and the first plate at least one fuel nozzle; a cap assembly extending generally radially and axially within at least a portion of the combustor and least partially surrounding at least some of the one or more fuel nozzles; wherein the cap comprises a first shroud that extends circumferentially inside the combustor, wherein the first shroud defines at least one inlet passage; a second shroud that extends circumferentially inside the combustor, the second shroud axially separated from the first shroud, wherein the second shroud defines at least one outlet passage; a first plate that extends radially inside the second shroud downstream from the at least one inlet passage of the first shroud and upstream from the at least one outlet passage of the second shroud, wherein the first plate defines at least one inlet port,at least one outlet port extending axially therethrough; a second plate that extends radially around the first plate downstream from the at least one inlet port and upstream from the at least one outlet port; a first fluid flow path from the at least one inlet passage to the at least one inlet port; a second fluid flow path from the at least one outlet port to the at least one outlet passage; and a baffle that extends from the first shroud to the first plate, wherein the baffle separates the first fluid flow path from the second fluid flow path, a sleeve that circumferentially surrounds at least a portion of the second shroud to define a first annular passage between the second shroud and the sleeve, wherein the at least one outlet passage provides fluid communication between the first annular passage and an outlet plenum of the cap at least partially defined by the first plate, the second shroud and the baffle through the second shroud; and a casing that circumferentially surrounds at least a portion of the sleeve to define an outer annular passage between the casing and the sleeve, the outer annular passage providing fluid communication between at least one of a compressor discharge plenum a compressor and an external cooling medium supply and the at least one inlet passage, wherein the at least one inlet passage provides fluid communication from the outer annular passage through the first shroud into an inlet plenum of the cap assembly defined by the first shroud, the baffle and the first plate