Alone in his chart-room he worked it out like this, mark two hours to the good for surprise and finding the tracks and delay in starting, say three hours if the guns were mounted in their epaulments, then the Arabs should start at seven. Supposing the camels go twelve hours a day at seven knots they would do eighty-four knots a day, while Shard doing three knots from ten to four, and four knots the rest of the time, was doing ninety and actually gaining. But when it came to it he wouldn't risk more than two knots at night while the enemy were out of sight, for he rightly regarded anything more than that as dangerous when sailing on land at night, so he too did eighty-four knots a day. It was a pretty race. I have not troubled to see if Shard added up his figures wrongly or if he under-rated the pace of camels, but whatever it was the Arabs gained slightly, for on the fourth day Spanish Jack, five knots astern on what they called the cutter, sighted the camels a very long way off and signalled the fact to Shard. They had left their cavalry behind as Shard supposed they would. The wind held good, they had still two oxen left and could always eat their "cutter", and they had a fair, though not ample, supply of water, but the appearance of the Arabs was a blow to Shard for it showed him that there was no getting away from them, and of all things he dreaded guns. He made light of it to the men: said they would sink the lot before they had been in action half an hour: yet he feared that once the guns came up it was only a question of time before his rigging was cut or his steering gear disabled. One point the Desperate Lark scored over the Arabs and a very good one too, darkness fell just before they could have sighted her and now Shard used the lantern ahead as he dared not do on the first night when the Arabs were close, and with the help of it managed to do three knots. The Arabs encamped in the evening and the Desperate Lark gained twenty knots. But the next evening they appeared again and this time they saw the sails of the Desperate Lark. On the sixth day they were close. On the seventh they were closer. And then, a line of verdure across their bows, Shard saw the Niger River. Whether he knew that for a thousand miles it rolled its course through forest, whether he even knew that it was there at all; what his plans were, or whether he lived from day to day like a man whose days are numbered he never told his men. Nor can I get an indication on this point from the talk that I hear from sailors in their cups in a certain tavern I know of. His face was expressionless, his mouth shut, and he held his ship to her course. That evening they were up to the edge of the tree trunks and the Arabs camped and waited ten knots astern and the wind had sunk a little.