A combustor assembly includes a combustion liner having a longitudinal axis and defining a combustion chamber, a flow sleeve housing the combustor liner, a casing housing the flow sleeve, and a plurality of impingement plates. The combustion liner and the flow sleeve are coaxially aligned and spaced apart radially forming an annular flow path within which the impingement plates are serially arranged longitudinally. Each impingement plate has a sleeve part connected to the flow sleeve, a liner part connected to the combustion liner and a central plate suspended in the annular flow path, coaxially arranged with the combustion liner, and including impingement holes. Each impingement plate defines a liner compartment and a sleeve compartment. Within the annular flow path, cooling air flows from the sleeve compartment, through the impingement holes and to the liner compartment of one impingement plate and therefrom to the sleeve compartment of a subsequent impingement plate.