The term "pompier" used in the title was a late-19th century term a derision applied to academic painting, as explained here. True, Piloty was that for most of his career, but I find his paintings generally less stilted than many others of that ilk.
Let's take a look:
Wallenstein was a leading general during the Thirty Years War (biographical information here). Eventually he was assassinated, the inspiration for this painting.
On display at the Neue Pinakothek.
Pompier subject matter -- a scene from the Crusades. Note the strong triangular composition.
A late painting. Here the composition is a wedge at the left pointing towards the sheet covering Alexander's body.
Background on the subject matter is here. This was painted when Piloty was probably at the height of his powers. His approach is something like that of a mural painter where an important objective is to fill the real estate with detail. In other words, it's not a painting to be grasped at a glance. The viewer is expected to scan it, seeking out and savoring various details the artist has provided. I must confess that, alas, my attention span is not geared for this.
interesting. In compensation, look at the expressions on the faces of the men at the right. Also, apologies for the usual poor-quality museum setting photography.