1) using a triangle, rather than circle as a perimeter to facilitate final protective fires
2) emplacing HMGs at each apex of the perimeter
3) clearing the perimeter of vegetation out to 1-1.5km
5) ensuring that all fighting positions are dug in 1-2m deep with adequate overhead cover
6) internal communication trenches between key positions
These are all basic, time-proven tactics in any Army’s toolkit.