A Participle is characterized as the non-finite form of the verb that is employed to denote a past or presently ongoing action which can also act as an adjective or adverb to modify a noun or verb. In the given sentence,"Competing" is the present Participle and it ends with "ing". The word looks like an adjective in the sentence. "Competing" modifies the noun "Teams" in the sentence.
Russian troops were mobilized against Austria-Hungary because Russia believed that Germany was hiding under the guise of the assassination of Austrian Archduke Franz Ferdinand to launch a war and protect their powers in the Balkans.
