An action packed night saw a Mike Fondop penalty ensured Guiseley won the tie 4-3 on penalties, they did this with ten men for most of the game with Chris M'Bongou being sent off before half-time, writes Tom Feaheny.
"The players were incredible, they deserve all the praise to come to a club flying in League Two to go down to ten men, the belief and work ethic didn't change, we wouldn't give up," Cox said.
"The work-rate, the attitude was all excellent, we have made history, this is a special occasion for Guiseley.
"We are developing a team ethic, the support was humbling, I'm just really proud of what I have seen. Fitness levels can play a part, we have worked so hard, I'm over the moon.
Guiseley's boss though says all focus now has to be on their game against Dag & Red at the weekend.
"The league is something we have our eyes fully on now, we've got some important games coming up that is our bread and butter."