 In 134 BC the army of Scipio Aemilianus in Spain had to march at night due to extreme heat, when some of its horses and mules died of thirst (even though earlier, in 181 BC, heavy spring rains prevented the Celtiberians from relieving the Roman siege of Contrebia).Through the 2nd century AD warm temperatures dominated particularly in the mountains along the north coast, punctuated by further cool spells from to 180.After about 200 the temperatures fluctuated, trending toward cool.