die Infanterie
infantry
The branch of the army whose soldiers fight on foot. It often forms the core of an army.
Mein Großvater diente während des Krieges bei der Infanterie.
My grandfather served in the infantry during the war.

infantry
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infantry
The branch of the army whose soldiers fight on foot. It often forms the core of an army.
Mein Großvater diente während des Krieges bei der Infanterie.
My grandfather served in the infantry during the war.

'Infanterie' (infantry) is a technical term from the military field. It is used when speaking precisely about the branch of foot soldiers.
Die Ausbildung bei der Infanterie ist körperlich sehr anspruchsvoll.
Training in the infantry is physically very demanding.
Common verbs used in connection with 'Infanterie' (infantry) are 'bei der Infanterie dienen' (to serve in the infantry), 'zur Infanterie gehören' (to belong to the infantry), or 'die Infanterie einsetzen' (to deploy the infantry).
Im Manöver wurde die Infanterie zur Sicherung des Geländes eingesetzt.
During the maneuver, the infantry was deployed to secure the area.
The word 'Infanterie' (infantry) is almost always used in the singular because it describes an entire branch of troops as a collective. The plural form 'Infanterien' is very rare.
Er war stolz darauf, zur Infanterie zu gehören.
He was proud to belong to the infantry.
army / host
'das Heer' and 'die Infanterie' both belong to the military on land. They can be confused because the infantry is an important part of the army. However, 'das Heer' means the entire land force, with various branches. 'die Infanterie' means only the soldiers who fight on foot. So you can say: the infantry is part of the army, but not the whole army. If you mean the entire land force, use 'Heer'. If you specifically mean foot soldiers, 'Infanterie' is appropriate.

Die Infanterie musste das Gelände zu Fuß sichern.
The infantry had to secure the area on foot.
In der Dokumentation wurde erklärt, wie das Heer organisiert ist.
The documentary explained how the army is organized.