Just look at the data to get a first idea. Here is some data for horse kick deaths in 10 Prussian Army Corps over 20 years. A program is given below to find the mean etc. Note corps G, I, VI and XI have different organizations from the others, and might behave differently. You may want to look at that.
G is the guard corps.
The book by Sokal and Rohlf ignores the Guard Corps. Total 75. . . . . . . . 4 Sum 16. A program to put in this data is given below. To do this you will have to separate out the data.