There are a number of ways to search for casualties on the website:
Enter any information you have in the boxes above. The list will show any record with a matching entry.
With the Regiment you may only know part of the name ie. Worcestershire or Hussars, enter that and get back a list of all records which match.
If you get no results try pluralising the name.
Searching by month will show those who died in that month for all years recorded here.
Searching by year will show all those who died in that year.
Entering both month and year will show only those who died in that month in that year