Messines

A German supply depot at Messines two months before the Battle of Messines (1917).

Poperinge

A pillbox near Poperinge, Belgium serves as a sightseeing stop for this British soldier and his two female companions.

Ypres, 1916

A pair of Germans at Ypres with contrasting artillery shells. A 75mm French shell casing resting on top of a 15in English dud.

53rd Infanterie Brigade

A member of the 53rd Infanterie Brigade. Another photo of what appears to be this same soldier can be found at Drake Goodman's excellent site. His photo was taken in 1915 in Liège, Belgium.I would assume that this fellow had this portrait taken as the group photo that is at the other site.

Wilhelm Stienbuck

A card from Wilhelm Stienbuck while serving in Roeselare, Belgium. The larger sign indicates he was part of the paying office for the woodworker's union (Holzarbeiter Verband Zahlstelle: Roulers). The smaller one reads Flandern 1917.

Update:
I just scanned this card which was a few cards down the line in the box. It is also to Dora Stienbuck from the same soldier. His first name here is a bit more legible and seems to be Wilhelnye. That does not come up in any search engine as a name. Regardless what his first name may be, Herr Stienbuck did serve at least two years. The earlier card was postmarked in April of 1915 and the other in March of 1917.

In 1915 the 18th Reserve Division was in the Lassigny area until October.

74th Landwehr in Belgium

A member of the 74th Landwehr posing by a damaged house in Belgium. His unit spent most 1916 in the area southeast of Ypres before moving to the Somme in October. Kruisstraat would be the site of three mine explosions during the Third Battle of Ypres.

Warneton, Belgium

A group of German soldiers in the rubble of a bombed building in Warneton, Belgium. Two of them stand out with their steel helmets and body armor.

Belgian Card Players

Nothing on the back of this card to help with the where or when of this photo.  The dark pants lead me to believe that this was taken before the war. In 1915 the army was supplied with Khaki uniforms modeled after those worn by the French Army.

Beverloo Camp

A group of Belgium soldiers at Camp Beverloo in Leopoldsburg, Belgium after the armistice.

Einzug unserer Truppen in Namur

The fortress at Namur fell to the Germans on August 24th after a three day bombardment. The city was occupied for the duration of the war.

Croix de Guerre with bronze lion attachment

Two Belgian Carabiniers. The one on the right is wearing a Croix de Guerre with bronze lion attachment. The bronze lion attachment is for mention in a dispatch at a regimental level.

Post war Belgium

A post war portrait of a soldier in Gand, Belgium. Wartime Belgian uniforms were supplied by the British while the helmet was from France.

Sanitätsmannschaften in Brussels

Landsturm-Infanterie-Battailon

Members of the Landsturm-Infanterie-Battailon from Kitzingen about to have a meal in Antwerp.

Mobilisatie 1914

Four members of the Belgium army upon mobilization in 1914.

Souvenir de Belgique

Royal Field Artillery, Ammunition Column

5 members of the Royal Field Artillery in postwar Belgium.

Destroyer

This is marked on the back in English "Air bombs on destroyer in Bruges".

Flanders trench

A well maintained German trench in Flanders.