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The sonar mapping of the Challenger Deep was possible by its Simrad EM120 sonar multibeam bathymetry system for deep water. The sonar system uses phase and amplitude bottom detection, with an accuracy of better than 0.2% of water depth across the entire swath (implying that the depth figure is accurate to ± 22 metres (72 ft; 12 fathoms)). [18 ...
The infantry phalanx was a Sumerian tactical formation as far back as the third millennium BC. [1] It was a tightly knit group of hoplites, generally upper and middle-class men, typically eight to twelve ranks deep, armored in helmet, breastplate, and greaves, armed with two-to-three metre (6~9 foot) pikes and overlapping round shields. [2]
Field entrenchment is the activity of provision of cover and concealment, usually by the infantry arm of service, possibly with assistance from combat engineers or sappers. The entrenched position is intended to be a temporary one, taking maybe a day to create and to be held for no more than a week.
Entrenchment, Entrenched or Entrench may refer to: A trench; Entrenchment (fortification), a type of fortification; Military trenches with relation to Trench warfare, especially that of World War I; An entrenchment clause within a constitution, a clause impervious to or somewhat shielded from the amendment process.
45/47 has promised to invoke the Alien Enemies Act of 1798 to spur Operation Aurora and deport upwards of 11 million undocumented immigrants. Never mind this will cause manifold emotional and ...
An Indian Wehrmacht volunteer in a Tobruk DFP along the Atlantic Wall, 1944. During the fighting in North Africa (1942–43), U.S. forces employed the shell scrape.This was a very shallow excavation allowing one soldier to lie horizontally while shielding his body from nearby shell bursts and small arms fire.
A redan within the Naxxar Entrenchment, an inland entrenchment in Naxxar, Malta Map of the Louvier Entrenchment, a coastal entrenchment in Mellieħa, Malta. In fortification, the term entrenchment (Italian: trincieramento, Maltese: trunċiera) can refer to either a secondary line of defence within a larger fortification (better known as a retrenchment), or an enceinte designed to provide cover ...
Russian anti-tank obstacles near the horizon, Kherson Oblast, May 2022. Dragon's teeth on the left, Czech hedgehogs on the right In Belgorod Oblast, defensive lines of dragon's teeth were constructed in October 2022 under the supervision of the Wagner Group along the Russia–Ukraine border, intended as a second line of defense alongside trenches and a trained militia in the event the ...