National Fried Chicken Sandwich Day is Tuesday and McDonald's, Burger King, KFC, Del Taco have deals - USA TODAY

The Chicken Sandwich Wars of 2021 will heat up for National Fried Chicken Sandwich Day Tuesday.

Fast-food chains including McDonald's, Burger King and KFC have specials for the made-up food holiday, held annually on Nov. 9.

McDonald's released three new chicken sandwiches in February and Burger King rolled out its Ch'King chicken sandwich in June. KFC also added a new chicken sandwich this year.

The major chicken sandwich war was launched in August 2019, a week after Popeyes launched its New Orleans-style fried chicken sandwich, which was its first nationwide chicken sandwich. The chain then started a viral Twitter feud with Chick-fil-A and other restaurants.

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The nation's chicken wars and cravings for comfort food during the pandemic have made poultry so scarce and expensive that some restaurants have had to limit chicken sandwiches, wings and tenders. Others have made changes to menus and promotions.