WH Plans to Develop a “Country Within a Country” of 15 Million “New Americans”
The new country is going to have an 8 metre high ring fence and be called "New Palestine"
never heard the concept of artillery barrage? in action it's funnier... but to cross that... walking on water is easier.
https://en.wikipedia.org/wiki/File:Army_mlrs_1982_02.jpg
or
.JPG/320px-M109A4_155_mm_SP_Gun,_CCFB_Valcartier,_Quebec,_5_Sep_2011_(26).JPG)
https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/M109A4_155_mm_SP_Gun%2C_CCFB_Valcartier%2C_Quebec%2C_5_Sep_2011_%2826%29.JPG/320px-M109A4_155_mm_SP_Gun%2C_CCFB_Valcartier%2C_Quebec%2C_5_Sep_2011_%2826%29.JPG
for cheaper munitions...
and if they get to close :
.jpg/320px-Apache_Gun_(M230_Chain_Gun).jpg)
https://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/Apache_Gun_%28M230_Chain_Gun%29.jpg/320px-Apache_Gun_%28M230_Chain_Gun%29.jpg
like arrows making the sky black... your zombies are no treat at all.