From that time until his death, at Germantown, April 29, 1785, he performed many hazardous missions for his church and the Provincial Government of Pennsylvania, and many times was in imminent peril. The first several years of his residence in Pennsylvania he was employed as a Moravian missionary, but afterwards was almost constantly performing important services for the Province in its Indian dealings. Some of the journals of Post, which appear in the Archives of Pennsylvania, and have been republished elsewhere, are valuable for the intimate history of the peoples and the country through which he traveled. One of the editors who republished his journals, wrote as follows concerning the missionary and mediator: “Antiquarians and historians have alike admired the sublime courage of the man and the heroic patriotism which made him capable of advancing into the heart of a hostile territory, into the very hands of a cruel and treacherous foe. But aside from Post’s supreme religious faith, he had a shrewd knowledge of Indian customs, and knew that in the character of an ambassador requested by the Western tribes his mission would be a source of protection. Therefore, even under the very walls of Fort Dusquesne, he trusted not in vain to Indian good faith.” When Conrad Weiser visited Shikellamy at Shamokin, May, 1743, he wrote: “As I saw their old men seated on rude benches and on the ground listening with decorous gravity and rapt attention to Post, I fancied I saw before me a congregation of primitive Christians.” In 1743 Post was married to a converted Indian woman, and endeared himself to all the Indians. But all was not smooth, for the Brethren were persecuted and humbled before their converts. Post, who had been on a journey to the Iroquois country, in March, 1745, was arrested at Canajoharie and sent to New York, where he was imprisoned for weeks, on a trumped-up charge of abetting Indian raids. He was released April 10. In 1758 it became a matter of importance with Governor Denny and Sir William Johnson, that a treaty of peace be secured with the Western Indians. Post was selected to convey to them the white belt of peace and reconciliation. Tedyuskung, the Delaware king, protested against his going, declaring he would never return alive, but the bold and confident Christian said it was a mission of peace, that God would protect him, and that he must go. On July 15, 1758, Post departed from Philadelphia with five Indian guides. He carried with him copies of the treaties made with Tedyuskung, belts of wampum and messages from the Governor. He made his trip by way of Bethlehem, Shamokin, Great Island, Chinclamoose, etc.