What’s with the “Gates of Vienna”?

Look up “Gates of Vienna” and you’ll find it’s the name of a longstanding blog (2004), which is anti the Islamisation of Europe. I’ve always thought of it as one of two most famous times that Europe fought back invasions of Ottoman (i.e.. Muslim) forces. The other most famous one being the original name of this blog, “The Battle of Tours”. 

/Snip: 

The site's name [Gates of Vienna] draws from the 1683 Siege of Vienna, where allied Christian forces repelled the Ottoman Empire's advance, symbolising for its contributors an analogous modern defense against jihadist expansionism and demographic shifts.[3]

An Occasional Reader claims there was no such battle since a Sichuanese peasant had assassinated one of the Mongol Khans, so no invasion of Mongol/Ottoman troops happened at the time. i.e. China saved Europe from Islamisation even if inadvertently. 

Two things: 

1. There actually was a *Siege of Vienna*. Which happened over three centuries after any of the Khans was killed in China:

The name "Gates of Vienna" derives from the Siege of Vienna, a major military engagement from July to September 1683 in which an Ottoman force of over 140,000 troops besieged the Habsburg capital, only to be repelled by a Holy League army of about 80,000, including a decisive Polish cavalry charge led by King John III Sobieski on September 12 that shattered the invaders and halted Ottoman advances into Central Europe.[12][13] This event, often regarded as a high-water mark of Ottoman power in Europe, symbolized the limits of Islamic expansion westward.[12]

2. There was no single documented Chinese assassin of a Khan. At least as far as the internet can find. There were indeed Khan deaths from fighting Chinese, but three centuries before the Siege of Vienna. 

Here is Google’s Gemini:

Based on historical records, 

there is no verified account of a single Chinese person assassinating a Mongol Khan, although several Khans died during campaigns in China or from illnesses contracted during them. 

However, historical records note several relevant, often mysterious, deaths:

• Möngke Khan (1259): He died during the Siege of Diaoyu Castle in Sichuan, China. While some accounts attribute his death to battle injuries or disease (dysentery/cholera), popular legends or alternate accounts sometimes cite assassination attempts during the fierce resistance by Song Chinese forces.
• Genghis Khan (1227): He died during a campaign against the Western Xia in China. While some legends suggest he was killed by a Tangut princess or by being shot with an arrow, most historians believe he died of illness or injuries from a fall during his final campaign.
• Assassination Attempt on Genghis Khan (Early career): Records indicate that during a battle, a warrior named Zurgadai (later given the name Jebe) shot an arrow that hit Genghis Khan's horse (or him, depending on the source) in the neck. Genghis Khan admired his honesty in admitting it and made him a high-ranking general. 

Context on the "Assassins":
While not Chinese, the Hashashin (Order of Assassins) from the Middle East interacted with the Mongols. Hulagu Khan, brother of Möngke, was tasked with destroying them, and later, the Mongols actually executed the Assassins' leader after he traveled to meet Möngke Khan. 

Conclusion:
While Chinese resistance was highly effective in killing or fatally injuring Mongke Khan in 1259 through siege warfare, a singular, documented "assassin" story is not supported by mainstream history.