Why were people protesting in Amritsar? Why were there troops in Amritsar?

Please answer this question the best you can and please answer it in your own words :)

the jallianwala bagh massacre also known as the amritsar massacre,took place on April 13 1919, when acting brigadier general Reginald Dyer ordered troops of the British indian army to fire their rifles into a crowd of unarmed indian civilians in jallianwala bagh, amritsar, Punjab killing at least 400 people

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the alfred thayer mahan award for literary achievement is awarded each year by the navy league of the united states. the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation. presented since 1957, "this award for literary achievement is awarded to a u.s. navy officer, u.s. marine corps officer, enlisted service member, or civilian who has made a notable literary contribution that has advanced the knowledge of the importance of sea power in the united states."[1]