A munition has a penetrator casing that houses a fuel-oxidizer mixture within the casing. A height of burst fuze is operatively coupled to the fuel-oxidizer mixture, to ignite the fuel-oxidizer mixture before impact with the target. By igniting the fuel-oxidizer mixture before target impact, the munition avoids the problem of the impact potentially causing damage to the fuze that would leave the fuze in operable. The fuel-oxidizer mixture may cause injury and damage into a space that has been breached by the penetrator casing, for example by expelling lethal combustion products (hot gases) into a hard target, such as a building or bunker, that has been breached by the penetrator casing. The hot gasses may also have the advantage of maintaining an opening that the penetrator passes through, with for example the hot gases glassifying the edges of a hole formed by the penetrator, such as through soil.