<p>In specific defence applications, the military equipment requires a stable support condition from the supporting soil to ensure precision in the use of the equipment. The soil conditions are site-specific and challenging in some cases, and there is a need to prevent excessive displacement and equipment settlement under operational conditions. The stabilizer legs with underlying anchor or spade systems serve as a mechanism to provide stability in these situations. This work presents a soil–anchor/spade interaction study under static and dynamic loading. Single- and three-cycle dynamic loads were considered. A three-dimensional finite element framework was developed that includes geometric modelling and optimization of anchor/spade configuration, material modelling for underlying soil conditions, and performing a nonlinear soil–structure interaction finite element analysis. The predictions focused on estimating the soil settlement and bearing capacity. The soil was modelled as inelastic, and material models such as the Mohr–Coulomb and Cap Plasticity models were used in the interaction analysis. The analysis was performed for seven representative sites across India for five different anchor/spade configurations. The analysis arrived at the site-specific choice of the anchor/spade system.</p>