By degrees, certainly, the inconceivably rapid and mighty extension of the Carthaginian power in Spain could not but excite the observation and awaken the apprehensions of the Romans.

In fact, in the course of the later years before the outbreak of war, they did attempt to set bounds to it.

About the year 528, mindful of their new-born Hellenism, they concluded an alliance with the two Greek or semi-Greek towns on the east coast of Spain, Zacynthus or Saguntum (Murviedro, not far from Valencia), and Emporiae (Ampurias); and when they acquainted the Carthaginian general Hasdrubal that they had done so, they at the same time warned him not to push his conquests over the Ebro, with which he promised compliance.

This was not done by any means to prevent an invasion of Italy by the land-route--no treaty could fetter the general who undertook such an enterprise--but partly to set a limit to the material power of the Spanish Carthaginians which began to be dangerous, partly to secure the free communities between the Ebro and the Pyrenees whom Rome thus took under her protection, a basis of operations in case of its being necessary to land and make war in Spain.

In reference to the impending war with Carthage, which the senate did not fail to see was inevitable, they hardly apprehended any greater inconvenience from the events that had occurred in Spain than that they might be compelled to send some legions thither, and that the enemy would be somewhat better provided with money and soldiers than, without Spain, he would have been; they were at any rate firmly resolved, as the plan of the campaign of 536 shows and as indeed could not but be the case, to begin and terminate the next war in Africa, -- a course which would at the same time decide the fate of Spain.
Further grounds for delay were suggested during the first years by the instalments from Carthage, which a declaration of war would have cut off, and then by the death of Hamilcar, which probably induced friends and foes to think that his projects must have died with him.