Emperor Trajan later arrived in Moesia, and he launched his first military campaign into the Dacian Kingdom c. March–May 101, crossing to the northern bank of the Danube River and defeating the Dacian army near Tapae, a mountain pass in the Carpathians (see Second Battle of Tapae). Trajan's troops were mauled in the encounter, however, and he put off further campaigning for the year to heal troops, reinforce, and regroup. During the following winter, King Decebalus launched a counter-attack across the Danube further downstream, but this was repulsed. Trajan's army advanced further into Dacian territory and forced King Decebalus to submit to him a year later.