To keep it short, Taqiyya is dissimulation when one is under threat. When one of the companions of the Prophet (S) was tortured by the disbelievers with fire, he ended up insulting Allah and the Prophet (S), was subsequently freed, and then went to the Prophet (S) and lamented. It was then revealed to the Prophet (S) that if one is forced to commit disbelief, it does not count as disbelief (Surah 16:106).
Historically speaking, it was generally Shi
ahs, especially Ismaili Shiahs who practiced this to avoid persecution in Sunni territories. The Templars also practiced something similar in their initiation ceremonies, new historical research has revealed that they did indeed practice spitting on Crucifixes, but not because of their rejection of Christianity, but instead to feign rejection of Christianity should they ever get captured by the Muslims.
As for “war is deceit”, that’s not Taqiyya, that’s a common war tactic throughout history.
Of course, YOU were the person I was referring to in my opening post. So, you can ignore what I say and accuse me of lying again if you wish.