Altogether, the position of senior major-general was a difficult one. To knit into an army such a mass of units, to create supplies out of nothing, to organize a commissary and means of communication, and maintain a firm front over a line of ten miles, these were the needs of the situation. We need scarcely marvel that Ward, old and enfeebled, with his hands tied by uncertain authority, could not meet them. A genius was needed in his place, and the good fortune was that the genius eventually came. In the meanwhile Ward, pottering at his task, depended much on the initiative of his subordinates. The passage from the Neck to Roxbury was now guarded by Brigadier-General John Thomas of Marshfield,[86] who to deceive the enemy as to his numbers occasionally marched his force of seven hundred round and round a hill. The ruse was successful, for Lieutenant Barker wrote that "at Roxbury there must be between 2 and 3000." Nevertheless, it is hard to believe that so important a post was long left so slightly guarded. Thomas exercised his men with equal profit in cutting down trees to obstruct the passage, and in throwing up earthworks. Of other entrenchments, at this stage, we hear little. Putnam wanted to fortify Prospect Hill, commanding the passage from Charlestown Neck, but could not get permission. Yet the whole country about Boston was dotted with low hills, on which might easily be made a chain of fortifications. Besides such work as Thomas's, for a month little was done. To be sure, early in May a party of provincials, gathered in Connecticut and Vermont, and headed by Ethan Allen and Benedict Arnold, took Ticonderoga by surprise, and gained for America a fine supply of cannon. We shall later see what was done with this artillery, but there was no present means of transporting it to Boston, and no powder for its use, and so there was no profit to the country save in encouragement. Until the 21st of May nothing happened near Boston save small skirmishes, and brushes of outposts. Here and there a floating battery of the British warped up near land and fired a few shots, and occasionally a squad of riflemen did a little pot-hunting on its own account. These skirmishes, except as they accustomed the provincials to the smell of powder, had no effect on the situation, until at last the opposing sides found that they had something worth contending for.