On June 1, 1774, Wednesday, the same day the British blockade of the Boston Harbor was to begin, the Colonies called for a Day of Fasting and Prayer "...to seek divine direction and aid." George Washington's diary entry that day was:

Went to church and fasted all day.

When informed that the British fired at the men of Lexington on April 19, 1775, George Washington replied:

I grieve for the death of my countrymen; but rejoice that the British are still determined to keep God on our side.

On July 4, 1775, in his General Orders as Commander in Chief of the Continental Army, General George Washington gave the order from his Headquarters at Cambridge:

It is required and expected that exact discipline be observed, and due Subordination prevail thro' the whole Army, as a Failure in these most essential points must necessarily produce Hazard, Disorder and Confusion; and end in shameful disappointment and disgrace.
The General most earnestly requires, and expects due observance of those articles of war, established by the Government of the army, which forbid profane cursing, swearing and drunkenness;
And in like manner requires and expects, of all Officers, and Soldiers, not engaged on actual duty, a punctual attendance of Divine Services, to implore the blessings of Heaven upon the means used for our safety and defense.

William Emerson noticed an immediate compliance with Washington's new orders regulating profanity, swearing and drunkenness in the army on July 4, 1775:

There is great overturning in the camp, as to order and regularity. New lords, new laws. The Generals Washington and [his adjutant, Charles] Lee are upon the lines every day. New orders from His Excellency are read to the respective regiments every morning after prayers.

On July 20, 1775, General Washington issued the order:

The General orders this day to be religiously observed by the Forces under his Command, exactly in manner directed by the Continental Congress. It is therefore strictly enjoined on all Officers and Soldiers to attend Divine Service; And it is expected that all those who go to worship do take their Arms, Ammunition and Accoutrements, and are prepared for immediate action, if called upon.

On September 14, 1775, from his headquarters at Cambridge, Massachusetts, General Washington sent the order to Colonel Benedict Arnold prior to his campaign against Quebec:

As the contempt of the religion of a country by ridiculing any of its ceremonies, or affronting its ministers or votaries, has ever been deeply resented, you are to be particularly careful to restrain every officer and soldier from such imprudence and folly, and to punish every instance of it.
On the other hand, as far as lies in your power, you are to protect and support the free exercise of the religion of the country, and the undisturbed enjoyment of the rights of conscience in religious matters, with your utmost influence and authority.

On the same day, in a personal letter to Colonel Benedict Arnold, September 14, 1775, General George Washington enlarged:

I also give it in charge to you to avoid all disrespect of the religion of the country, and its ceremonies. Prudence, policy, and a true Christian spirit will lead us to look with compassion upon their errors without insulting them.
While we are contending for our own liberty, we should be very cautious not to violate the rights of conscience of others, ever considering that God alone is the Judge of the hearts of men, and to Him only in this case they are answerable.

On February 26, 1776, General Washington issued the orders:

All officers, non-commissioned officers, and soldiers are positively forbid playing at cards and other games of chance. At this time of public distress men may find enough to do in the service of their God and their country, without abandoning themselves to vice and immorality.