IRVING, Texas -- Since May 16, the Dallas Cowboys have signed, traded, acquired, put on injured reserve or released 28 defensive linemen. They saw another, Josh Brent, retire on July 18.

Everett Dawkins and Hall Davis are the latest additions. Dawkins was signed off the Minnesota Vikings' practice squad to the active roster, and Davis filled the final practice-squad vacancy.

There has been an incredible amount of movement on the Cowboys' defensive line. If you remember the Travis Chappelear era consider yourself fortunate.

Check out these transactions by date involving only the defensive line:

May 16 – Signed Anthony Hargrove

June 5 – Waived/injured Robert Callaway

June 11 – Signed Jeris Pendleton

June 20 – Cut Hargrove

June 25 – Signed Jerome Long

July 18 – Josh Brent retired

July 26 – Signed George Selvie and Landon Cohen

July 31 – Cut Ike Igbinosun, signed Toby Jackson

Aug. 1 – Waived/injured Cameron Sheffield

Aug. 6 – Waived Monte Taylor, signed Jabari Fletcher

Aug. 12 – Signed Travis Chappelear

Aug. 13 – Claimed Thaddeus Gibson

Aug. 19 – Waived Chappelear, Jackson

Aug. 21 – Signed Jason Vega

Aug. 26 - Cut Pendleton

Aug. 27 – Placed Tyrone Crawford on injured reserve, Jay Ratliff on reserve/PUP

Aug. 31 – Cut Fletcher, Gibson, Long, Vega; acquired Edgar Jones from Kansas City

Sept. 1 – Traded Sean Lissemore to San Diego

Sept. 2 – Signed Vega to practice squad

Sept. 3 – Acquired Caesar Rayford from Indianapolis

Sept. 5 – Chappelear waived off injured reserve

Sept. 7 – Placed Ben Bass on injured reserve; re-signed Long

Sept. 17 – Cut Cohen, signed David Carter

Sept. 24 – Cut Long, signed Drake Nevis

Sept. 25 – Placed Anthony Spencer on injured reserve

Oct. 15 – Cut Carter, Signed Jarius Wynn

Oct. 16 – Released Ratliff off reserve/PUP

Oct. 18 – Signed Vega off practice squad; placed Jones on IR to return list

Oct. 21 – Signed Marvin Austin

Oct. 29 – Released Vega; signed Everette Brown

Oct. 31 – Signed Vega to practice squad

Nov. 5 – Cut Austin

Nov. 6 – Signed Everett Dawkins off Minnesota practice squad; signed Hall Davis to practice squad