Methods and compounds for treating, preventing, reducing the risk of and/or delaying the onset of a microbial infection in a subject are disclosed herein, wherein the microbial infection is caused by one or more microorganisms (e.g., one or more bacteria) which can be used as a biological weapon, such as Bacillus anthracis, Franciscella tularensis, Yersinia pestis, Burkholderia mallei, and Burkholderia pseudomallei. Also disclosed are pharmaceutical compositions or kits for treating, preventing, reducing the risk of and/or delaying the onset of a microbial infection.