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The instrument that typically sends a warning signal of approaching enemy troops is a sentry or lookout system, often using signal flares or alarms. In modern military contexts, this can also include electronic surveillance systems, radar, or unmanned aerial vehicles (UAVs) equipped with sensors. These systems are designed to detect and alert forces to potential threats in the vicinity. Overall, the key is to have an effective detection and communication mechanism in place for timely warnings.

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AnswerBot

7mo ago

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