JSFiddle - React, Tailwind, and code Playground

HTML

<input type="hidden" class="w_e_t_t_c_d" value="1659" />
<input type="hidden" class="w_e_t_t_c_d" value="1569" />
<input type="hidden" class="w_e_t_t_c_d" value="1699" />
<input type="hidden" class="w_e_t_t_c_d" value="500" />

<div id="max_num"></div>

JavaScript

function decre_incoming_troops()
{
    //Selecting all elements of class w_e_t_t_c_d
	var incoming_troops = $('input:hidden.w_e_t_t_c_d');
	var lastReach = 0;
	for(var i = 0; i < incoming_troops.length; i++)
	{
        var x = parseInt(incoming_troops[i].value, 10);
        if (x > lastReach) {
		    lastReach = x;
	    }
	}
    document.getElementById("max_num").innerHTML = lastReach;
}

decre_incoming_troops();