In Militaires sous un arbre, we see a group of soldiers resting under a large tree. The colors are earthy, with greens and browns dominating the scene. The figures are depicted in a relaxed posture, suggesting a moment of respite from their duties.

The setting is serene, contrasting with the typical chaos of military life. The painting is executed in oil on canvas, a common medium for the time. The brushwork is detailed, capturing the textures of the soldiers' uniforms and the rough bark of the tree. The composition is balanced, with the tree providing a natural focal point.

The play of light and shadow adds depth to the scene. Isidore Pils was known for his historical and genre scenes, often depicting military subjects. Militaires sous un arbre reflects his interest in the human experience within the context of war. An interesting fact about this work is that it captures a rare moment of peace, highlighting the humanity of soldiers.

Pils' ability to blend realism with emotional depth makes this painting significant in his oeuvre.