Background
After a series of Mongol invasions of Korea between 1231 and 1281, Goryeo signed a treaty in favor of the Mongols and became a vassal state.

First invasion preparations
The Khan was willing to go to war as early as 1268 after having been rebuffed twice, but found that his empire did not have the resources to provide him with a sufficient navy at that time. With Mongol entry into the Korean court by marriage of the Korean crown prince to Kublai Khan's daughter, a mass construction of ships began on Korea's south-eastern shores, while the Mongols continued to demand Japan's surrender.

First invasion (1274)
According to the Yuanshi, the Yuan fleet set out with an estimated 15,000 Mongol and Chinese soldiers and 1,600–8,000 Korean soldiers in 300 large vessels and 400–500 smaller craft along with several thousand sailors, although figures vary considerably depending on the source and many modern historians consider the numbers exaggerated.

и наш'те с това мизерно подкрепление от 3000 души докъде ще го докарат ми е интересно

пуснаха интересен сериал Марко Поло

Зависи какво разбираш...

Имаше го и културния шок на младия Марко при контакта с непознати народи. Още отказа на европейците да разберат чуждите културни ценности от разказите на баща му, чичо му и неговите собствени.