..."We must only keep on the alert, and not change ourencampment for a safer one until those return who remainedalive in the castle... 
Antonio de Trueba Henry J. Gill 「The Cid Campeador」
...For some time she had been on the alert thinkingthat Desgas and his squad would soon overtake them, but these came from theopposite direction, presumably from Miquelon...
Baroness Orczy 「The Scarlet Pimpernel」
...His mind was all intent upon the advancing troop, his wits alert and gathered together for a leap in whatever direction should be indicated...
Rafael Sabatini 「Scaramouche」
... Her lazy eyes were now alert to search that lean face of his...
Rafael Sabatini 「Scaramouche」
...Instantly every faculty of his mind was upon the alert...
Edgar Rice Burroughs 「The Beasts of Tarzan」
... An alert anddaring brain figured upon the chances of success when a certain planshould be put to the test...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
...Even the individuals became less watchful and alert, so that one mighthave thought Numa and Sabor and Sheeta entirely deleted from the schemeof things...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
...His eyes, his ears and his keen nostrils were ever on the alert...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
... Presently,along the game trail that Werper and Tarzan had been following, therecame in sight a sleek, black warrior, alert and watchful...
Edgar Rice Burroughs 「Tarzan and the Jewels of Opar」
... Instantly the askaris and the whites were on the alert...
Edgar Rice Burroughs 「The Son of Tarzan」
...The lad was too thirsty by now to cavil at anything even remotelyresembling water, so he drank his fill while Akut stood with raisedhead, alert for any danger...
Edgar Rice Burroughs 「The Son of Tarzan」
...The boy followed close upon his heels, his every sense upon the alert,his nerves keyed to the highest pitch of excitement...
Edgar Rice Burroughs 「The Son of Tarzan」
... He was, upon theinstant, another creature—wary, alert, ready...
Edgar Rice Burroughs 「The Son of Tarzan」
...Meriem stopped short in her tracks, listening again, and sniffing—morethan ever the tigress; alert, ready...
Edgar Rice Burroughs 「The Son of Tarzan」
...But suddenly Jeanne was alert, and with her alertness came terror for the beloved...
Baroness Orczy 「El Dorado」
... “You didn’t expect me?” cried Rupert, and in an instant the thought of a trap seemed to flash across his alert mind...
Anthony Hope 「Rupert of Hentzau」
...The uneasiness of the trader was continually showing itself, and, upon the whole, he had reason to be on the alert both day and night...
David Livingstone 「Missionary Travels and Researches in South Africa」
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