impassable obstacles

  • 11Maginot Line — Ligne Maginot Part of Maginot Line Eastern France …

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  • 12Tanks in World War I — The development of Tanks in World War I began as a solution to the stalemate which trench warfare had brought to the western front. The first prototype of the Mark I tank was tested for the British Army on 8 September 1915. Although initially… …

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  • 13fortification — /fawr teuh fi kay sheuhn/, n. 1. the act of fortifying or strengthening. 2. something that fortifies or protects. 3. the art or science of constructing defensive military works. 4. Often, fortifications. military works constructed for the purpose …

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  • 14Battle of the Somme — Infobox Military Conflict conflict = Somme Offensive partof =the Western Front of World War I caption = Men of the 11th Battalion, the Cheshire Regiment, near La Boisselle, July 1916 date = 1 July – 18 November 1916 place =… …

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  • 15Rock crawling — is an extreme form of off road driving using vehicles anywhere from stock to highly modified to overcome obstacles. In rockcrawling, drivers drive highly modified four wheel drive vehicles such as trucks, Jeeps, and buggies over very harsh… …

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  • 16Steamboats of the Mississippi — GeographyThe Mississippi is one of the world’s great rivers. It spans 3860 miles of length as measured using its northernmost west fork, the Missouri River, which starts in the Rocky Mountains in Montana, joining the Mississippi proper in the… …

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  • 17Granite, Oregon — Infobox Settlement official name = Granite, Oregon settlement type = City nickname = motto = imagesize = image caption = image imagesize = image caption = image mapsize = 250px map caption = Location in Oregon mapsize1 = map caption1 =… …

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  • 18Fortification — Fort and Fortress redirect here. For other uses, see Fort (disambiguation) and Fortress (disambiguation). For other uses, see Fortification (disambiguation) …

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  • 19Oxford and Cambridge Far Eastern Expedition — The vehicles, team and kit laid out The expedition vehicles alongsi …

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  • 20Land mine — For other uses, see Land mine (disambiguation). Minefield redirects here. For other uses, see Minefield (disambiguation). Examples of anti personnel mines. From left to right: an M14, Valmara 69 (a bounding mine), and VS 50 …

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