What is the main topic of Riyad us Saliheen Hadith 1351?

Riyad us Saliheen Hadith 1351 is from chapter "The Book of Jihad". Summary: The Prophet (ﷺ) said, "War is deception." [Al-Bukhari and Muslim].

Riyad us Saliheen: Hadith 1351

12. The Book of Jihad

1351

Riyad us Saliheen

وعنه وعن جابر، رضي الله عنهما أن النبي صلى الله عليه وسلم قال‏:‏ ‏‏الحرب خُدعة‏"‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏

Abu Hurairah and Jabir (May Allah be pleased with them) reported:

The Prophet (ﷺ) said, "War is deception."

[Al-Bukhari and Muslim].

Reference: Sunnah.com : Book 12, Hadith 68
Arabic/English book : Book 12, Hadith 1352