English translation of the memorial:

446 BOMB GROUP UNITED STATES ARMY AIR FORCE VLUCHT 648	446 BOMB GROUP UNITED STATES ARMY AIR FORCE VLUCHT 648
TERUGKEREND VAN EEN BOMBARDEMENTSVLUCHT OP 26 SEPEMBER 1944 OM 17.20 UUR OP DEZE PLAATS NEERGESTORT.	WHILE RETURNING FROM A BOMBING MISSION ON 26 SEPTEMBER 1944 CRASHED AT THIS LOCATION AT 17:20 HOURS.
LIBERTOR B-24 J 42	LIBERATOR B-24 J 42
TER NAGEDACHTENIS AAN DE BEMANNINGSLEDEN DIE DIT NIET OVERLEEFDEN	IN COMMEMORATION OF THE CREWMEMBERS WHO DID NOT SURVIVE
THOMAS H. GILL 2/LT PILOT 24 JAAR	THOMAS H. GILL 2/LT PILOT 24 YEARS OLD
WILLIAM G. RAYNER 1/LT CO PILOT 24 JAAR	WILLIAM G. RAYNER 1/LT CO-PILOT 24 YEARS OLD

From a local newspaper:

RIJSWIJKS MEMORIAL FOR BOMBER

Saturday 26 September 2009, 13:27

RIJSWIJK – On Saturday a memorial will be unveiled dedicated to an American B24-J Liberator-bomber, which crashed in September 1944 in the neighborhood.

Two crewmembers were killed. The were shot by the Germans. The memorial will be composed of a stone with an erected propeller blade.

The aircraft Lil’Max with eleven men on board returned from bombing a railway-yard in the German town of Hamm. It was shot at and crashed in a pasture behind the then-existing farm ‘Op Hoop van Zegen’.

The crewmembers had bailed out by that time.