A brother named Alexander Hume Rule (1843-1906) from Des Moines, Iowa, gave a report on December 27th, 1892 into an assembly missionary publication known as "Letters of Interest" (printed by A.J. Cowell, on Oxford Road, in Ealing; and distributed by the Bible & Tract Depot, Yonge St., Arcade, Toronto, Ontario); The following is an excerpt, the full article can be found at BrethrenArchive.

Alexander "A.H." is credited as having started the first assembly in Des Moines, Iowa: the Des Moines Meeting Room in the Fall of 1880, from a foreword of an online book of his at Bible Truth Publishers. He was born in Scotland, raised Presbyterian, coming to the United States in 1852, and settled on a farm in Neponset Township, Bureau County, Illinois, and introduced to the PB while serving with a Presbyterian mission in Egypt, and reading William Kelly. Unknown if his mother was related to the Enlightenment philosopher David Hume (1711-1776), though both were from Scotland.

Rule was a graduate of Monmouth Seminary in 1871, now a part of Pittsburgh Theological Seminary;

Sources

Bible Truth Publishers
Letters of Interest 1892
Philip Allan 12-16-2019 for 1852, 1874 and emigration place
Ancestry.com

Alexander Hume Rule

Sources

BrethrenPedia