WWI Occupied Belgium: Namur Citadel Open Air Theater Feldpost (Vintage PC 1915)

black and white historical postcard showing the "plaine des jeux et théâtre d'été" (playground and summer open-air theater) at the citadel of namur in occupied belgium during the first world war. the panoramic view shows the grand neoclassical stadium structure and outdoor seating with a crowd gathered, overlooking the city landscape in the background. published by ern. thill, bruxelles.
the reverse side features a handwritten feldpost message dated 29 march 1915, signed by a soldier ("karl r.") from the infantry regiment 247 ("11./247"), sending easter greetings to aalen, germany.
it bears a very clear, sharp circular military postmark "* feldpostexped. 7. landwehrdivision *" dated 29 march 1915.