He supplied the pulpit of the American Chapel in Paris for a short time, and afterward visited Rome, where he was invited to assist in the establishment of what became under his labors a flourishing and useful church for resident and visiting Americans, the first for English-speaking people tolerated within the walls. In the pastor's parlors, facing the windows of the Propaganda Fide, many notable assemblies were gathered. Here were taken the first steps toward the organization of a union of the Sunday-school forces in Italy. Here were held important meetings of the Italian Bible Society, and here was organized the first Young Men's Christian Association in Italy, its members including Italians of every evangelical faith. He established a Bible training school for Italian young men, so planned as to secure the approval and co-operation of Italian ministers of every denomination, and was also instrumental in the establishment of a school among the soldiers of the Italian army stationed in Rome, out of which grew a church, composed wholly of men in the military service, its creed being that of the Apostles. Many persons, native and foreign, assisted on the occasion, memorable in the history of religious progress in Rome, when the sacrament of the Lord's Supper was administered to these modern soldiers of Caesar's household. This work has been efficiently continued to this day under other direction, and thousands of ex-soldiers in all parts of Italy have borne with them to their homes the influence of their Catholic Christian training in the _Scuola_ of the _Chiesa Evangelica Militare_. Dr. Waite's inquiries early led him to look upon sectarianism as one of the most serious obstacles to the progress of evangelical truth in Italy, and to the belief that the presentation of a united Christian front, in agreement upon the fundamental truths of the gospel, was essential to that influence upon the mind which would bring the most hopeful elements among the Latin peoples into practical unity with Protestant Christianity. He therefore energetically espoused the cause of Christian unity, of which the church in Rome, in its ingathering of worshippers of all creeds, was made a notable example.