Obstacles alone may not be sufficient to stop or destroy a target completely, but they can degrade its mobility. This helps to make firepower more effective. This study examines when using both counter-mobility measures (CM) and firepower effects (JF) together yields greater effectiveness than using them separately. Monte Carlo simulations in MATLAB 2025a were used to compare CM, JF, and CM+JF. The comparison is based on the probability of detection (PD) and the weapon system availability rate (WSAR). Synergy is measured in two ways: (i) Ddiff, which shows how many more targets are destroyed with CM+JF compared to using CM and JF separately, and (ii) the index S, which shows the total effect of CM+JF compared to the sum of the CM and JF effects. The results showed positive synergy in most cases, with 44 of the 50 combinations having a positive lower bound for the 95% confidence intervals of Ddiff.