Here is a little part of why he wrote her. Link is provided. Remember one thing. What they wrote was considered treason against the King. What they wrote just the day before he sent her this would lead to their deaths if America lost ..... John Adams wrote: But the Day is past. The Second Day of July 1776, will be the most memorable Epocha, in the History of America.—I am apt to believe that it will be celebrated, by succeeding Generations, as the great anniversary Festival. It ought to be commemorated, as the Day of Deliverance by solemn Acts of Devotion to God Almighty. It ought to be solemnized with Pomp and Parade, with4 Shews, Games, Sports, Guns, Bells, Bonfires and Illuminations from one End of this Continent to the other from this Time forward forever more.5
You will think me transported with Enthusiasm but I am not.—I am well aware of the Toil and Blood and Treasure, that it will cost Us to maintain this Declaration, and support and defend these States.—Yet through all the Gloom I can see the Rays of ravishing6 Light and Glory. I can see that the End is more than worth all the Means. And that Posterity will tryumph in that Days Transaction, even7 altho We should rue8 it, which I trust in God We shall not.
Maybe horseshoes? Just guessing.