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The 7th New York National Guard in US service in 1861 turned to straw hats for some relief from the sun, other than their jaunty kepi's...
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The veterans of the 22nd Massachusetts recalled making wide use of local hats, including straw ones, in the field. By September, 1862:
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The veterans of the 3rd New Hampshire recorded that per General orders no. 40, May 22, 1863, the troops were to receive straw hats for summer wear...
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The lads of the 64th New York noted that the troops in the Army of the Potomac liked straw hats, but could only get them on campaign principally...
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Among the Union Cavalry commanders at Gettysburg, Generals Pleasanton and Custer were described as wearing straw hats...
The order books of the 1st Massachusetts cavalry noted in the summer 1864 the men were allowed to wear whatever citizens' hats they wanted (They were already doing so), including straw hats... but in no case with officer's hat cords etc. affixed.
General Hancock's "Veterans Corps" was authorized straw hat wear in the garrisons around Washington DC in 1864...
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Sherman's troops after the march to the sea were described as rather worse for wear for clothing, and many making due with local citizen's hats, including straw ones, among units like the 2nd and 4th Minnesota...
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...by the Battle of Bentonville in March, 1865 Sherman's troops generally were in similar dress according to the 75th Indiana's veterans...
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Capt. Allan Dougall recalled of the troops at Bentonville (for which he was awarded the medal of honor);
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They received new army clothing before the victory parade at Washington...
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Post-war, Regulars in the Dept. of the South under Gen. Terry were similarly authorized to wear straw hats in hot weather, at least off parade... From June 4, 1870:
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