How many of his children did Heber C. Kimball personally baptize at one time?
From the life of Christopher Layton: Just as the Saints were moving west the government called on the “Mormons” for five hundred soldiers to fight in the Mexican war. Christopher Layton was one of the first to volunteer. He started on the famous march to California, July 16, 1846, and served in the Mormon Battalion until he was honorably discharge in Los Angeles, Cal., July 15, 1847. After his discharge he was employed by Mr. Sutter, a rancher near Sacramento. While there, gold was discovered, by members of the Mormon Battalion. There being at that time a demand for horses, Christopher Layton returned to Los Angeles and bought some; he took them to San Francisco, where he sold them with considerable profit. The means thus earned he sent to the Bank of England. While at San Francisco, he had the misfortune to break his leg; but as soon as he was able he set sail for England, landing there in March, 1850. After paying his tithing on the money earned, to the presiding Elder (Apostle Orson Pratt), he went home and there received the sad news of the death of his mother, only two weeks before his arrival. Soon after reaching home, he married Sarah Martin; in 1850 he returned to America with his wife and six relatives and forty-six friends, paying the passage for all of them.
Andrew Jenson, LDS Biographical Encyclopedia (Salt Lake City: Publishers Press, 1901) 1:363-364.