When Doctor Who was rebooted in 2005, one of the main themes since then was the "Last Great Time War" that pitted the Daleks against the Time Lords.

But how does one actually fight a time war? Do you send your forces deep into the past of your enemy? Change history so that your enemy is weaker or perhaps doesn't exits? Wouldn't this cause such paradoxes that the Reapers (introduced in Episode 8 of Series 1, Father's Day) to try and restore time?

Certainly, according to this link, the "Order of the Black Sun", sent an agent back in time to just around the time the Time Lords were starting their time travel experiments, only for the event to help them establish time travel.

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    How do you fight a time war? Very carefully. – Paul D. Waite Apr 5 at 19:53
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    In a wibbly-wobbly way? – DJClayworth Apr 5 at 20:31
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    In a timely fashion? – beichst Apr 6 at 13:26
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    My understanding is every attempt to delete the Daleks from history spawned something worse. It's probably also worth noting that the Davies era notion of war was vastly more surreal than Moffat's. For example Davies had the entire war and the Fall of Gallifrey still burning but locked behind a time lock wall wiping out all traces of Daleks and Timelords from the universe. Moffat had the Daleks shoot themselves in a circle. The War Doctor has had a novel and audio stories so that would be the most canon answer. More canon than a trek novel but less controlled than a star wars EU. – lucasbachmann Apr 6 at 18:30
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    If you want semi-canonical in-universe answers, you can have a look at the Time War ranges (e.g. Gallifrey, The War Doctor and The War Master) from Big Finish. Not sure you will be much wiser, but maybe you'll be entertained. – skymandr Apr 7 at 10:53

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