This Day We Fight!

is a song by American heavy metal band Megadeth, which appears on their twelfth studio album Endgame, which was released on September 15, 2009, written by frontman Dave Mustaine.

[5][6][7] The song, like a vast majority of Megadeth's songs, was written by Dave Mustaine, and was lyrically inspired by J. R. R. Tolkien's The Lord of the Rings trilogy, particularly Aragorn's speech at the Black Gate of Mordor during the Battle of the Morannon, as well as Théoden's speech at the Battle of the Pelennor Fields.

[10] The song was also further inspired by "warrior creed from the great Sun Tzu with the use of drums and flags in ancient war".

[4][15] Adrien Begrand of Popmatters stated that he felt "With its furious back-and-forth solos, opening instrumental "Dialectic Chaos" wastes no time in showcasing that dynamic between Mustaine and Broderick, and combined with the pure speed of "This Day We Fight!

", longtime fans will be instantly reminded of the bracing "Into the Lungs of Hell"/"Set the World Afire" one-two punch that kicks off 1988’s great So Far, So Good...

"[19] The song then progresses, containing "a breathtaking, high-pitched bend followed by some insane shredding that shuffles through licks ending with a last, lower-pitched note.

"[19][20] The song was featured in the 2010 video game Guitar Hero: Warriors of Rock, alongside "Holy Wars...

[25] Peter Hodgson of "iheartguitar" was positive of the song and wrote that "The pace of it, the unrelenting aggression, the insane fret-work – Mustaine sounds beyond pissed-off and this is going to kick all kinds of ass when it’s blasted out live.

has also been described as "possibly Megadeth's best song of the past 20 years, with speed, ferocity and anger that even younger bands would have trouble keeping up with".

[28] It contains no lyrics, making it the only instrumental track on the album, and is considered to hold a kinship with "This Day We Fight!

[30] "Dialectic Chaos" has however been able to find its own identity as a song, and has been described as "the epic instrumental", "the gateway to this record" and "fast, rude and in your face" by reviewers.

Mustaine has recently been telling all and sundry that former Nevermore and Jag Panzer man Chris Broderick is the best fellow axeman he’s ever had in Megadeth and on this blistering opening (and throughout the album), the lead trade-off’s between the two are nothing short of mind-blowing.