Francis Marion Hobbs was a Texas Ranger.

1850 Census of Medina River, TX

Francis Hobbs, 18, IN, Private, Ranging Company
Pleasant H. Hobbs, 21, IN, was 4th Corporal, Ranging Company

Francis and Pleasant were also listed with their father in Walker Co:

1850 Census of Walker Co TX

Name Age
Jas Hobbs 60 MD
Anna Hobbs 58 NC
Talman Hobbs 16 IN
Frank Hobbs 18 IN
Pleasant Hobbs 24 IN
Erin T Slayman 6 TX

It appears that he may have returned to Indiana:

1860 Census of Patoka, Crawford Co IN

Name Age
Francis M Hobbs 26 IN
Nancy M Hobbs 26 IN
Amanda J Hobbs 6 IN
Sarah E Hobbs 5 IN
Louisa A Hobbs 3 IN
James T Hobbs 1 IN

1880 Census of Jefferson, Dubois Co IN

Name Age
Francis M. Hobbs 47 self IN MD VA
Nancy M. Hobbs 48 wife IN KY KY
William J. Hobbs 18 son IN IN IN
Nancy M. Hobbs 15 dau IN IN IN
Lucinda I. Hobbs 12 dau IN IN IN
Alverda A. Hobbs 10 dau IN IN IN
George F. Hobbs 8 son IN IN IN
Emma C. Hobbs 2 dau IN IN IN

1900 Census of White River, Gibson Co IN

Name Age
Mary Hobbs 66 head widowed IN IN IN
Martin Hobbs 28 son single IN IN IN
Peter Hobbs 25 son single IN IN IN
George Hobbs 30 son single IN IN IN
Emma Hobbs 19 dau single IN IN IN