The Crown Prince was really the Crown Princess

Cecilie of Mecklenburg-Schwerin (Cecilie Auguste Marie; 20 September 1886 – 6 May 1954) was a Crown Princess of Germany and Prussia as the wife of German Crown Prince William, the son of German Emperor William II.

Tuesday, September 17, 1918:

Great mistake made! Our goat is not a he. It’s a she. This dire fact forced us to change her name to Cecilia which was done with full and proper ceremony.
Everything now quiet up front. Another advance was made by us last night and Villers-sous-Prény is now in our hands. No extra cars were called out and the Boche avions only got us up once. The hospital at Dieulouard was hit by shell fire last night–3  killed and 17 wounded.

Relief was made this A.M. and those cars coming back from Norroy[-lès-Pont-à-Mousson] were loaded with souvenirs--41 rabbits, Boche helmets, Boche gas-masks, Boche mess kits, Boche field-glasses and revolvers, Andie appeared in a complete Boche officer’s uniform with leather hip boots all of which fit him like made to order. Postcards, clocks and a hundred different trinkets are floating around camp now. The gas-masks are interesting--apparently their latest issue, for they were stored in a room still wrapped up in paper. There’s not a piece of rubber on the mask. The French and ours is practically all rubber. The Boche mask is leather--a high grade of very soft leather of two thicknesses on the face. The head bands instead of being rubber are cloth with springs enclosed to make them elastic. The eye pieces are reinforced, or rather protected, by small metal bars--against crushing or pulling a finger through. Very neat, practical and well put up.