Since EHV-1 is a common virus in horses, it is recommended that all horses be vaccinated at least once a year. For horses congregating at shows and competitions, more frequent vaccinations may be recommended.
Enfilade and defilade. Enfilade and defilade are concepts in military tactics used to describe a military formation's exposure to enemy fire. A formation or position is in enfilade if weapons fire can be directed along its longest axis.
Geographic. 1  Defile: a geographic term for a narrow pass or gorge between mountains. It has its origins as a military description of a pass through which troops can march only in a narrow column or with a narrow front. 2  Debouch: 3  To emerge from a defile or similar into open country; 4  A fortification at the end of a defile;