Landwehr is a German term that refers to a military reserve force that is usually seen as a second line of defense. The term was originally used during the Napoleonic Wars of the 19th century, and since then, it has become part of the military lexicon. If you are looking for synonyms for Landwehr, some words that come to mind include the home guard, territorial defense force, militia, and national guard. These terms are often used interchangeably, especially when describing a military reserve force that serves to protect a nation in times of war or civil unrest. Other related terms include reserve army, reserve militia, and reserve defense force.